Lastly A Radiator With Choices!

What is a fan clutch wrench you could be asking yourself. The engine could be capable to remain cool at low speeds because it’s not operating as difficult and not making as much heat. From time to time you may want to operate on the radiator or on other elements of the car’s cooling technique and you have to be really cautious when doing so. The radiator’s fan is extremely potent and dangerous and you should disconnect its wires that come from the battery (the fan is usually electric driven and commanded). Placed behind the radiator – while protected from the dirt and grime, and to a specific extent the rainwater hitting the front of the car – the situations are significantly hotter, to the feasible detriment of the fan’s electric motor. Nonetheless, as spring turned to summer season, I discovered that the car’s temperature gauge would drift into the red if I got caught in hot traffic, and if unchecked, the vehicle would puke coolant out from under the radiator cap. Engine radiator fans transfer the excess amount of heat that is produced by the car and therefore protects the components from being burnt and wearing out prior to time. Thermostat is an crucial component of a vehicle’s cooling technique. When you improve your automobile engine energy, more heat is created. Fan producers base their measurements on a common measurement with clean, dry air at a density of .075 pounds mass per cubic foot, barometric stress at sea level of 29.92 inches of mercury, and a temperature of 70°F. 1. Single high efficiency fans call for a minimum of three.five” clearance between your automobile radiator and engine pump. 120mm fan with special 9 blades design and style is engineered to create higher airflow without having compromising on ultra-silent operation. Coolant is heated in the engine, becomes less dense, and so rises. Some engines have an oil cooler, a separate small radiator to cool the engine oil Cars with an automatic transmission frequently have further connections to the radiator, enabling the transmission fluid to transfer its heat to the coolant in the radiator. We have high speed radiator fan universal fans suitable for a range of applications, fan kits, and fans for well-liked autos identified on Australia’s roads. Boilers also work much more effectively the cooler the return temperature, so by extracting as considerably heat as attainable from your radiator will assist them with this. A broke fan belt could be another explanation for the engine overheating. For long automobiles, such as buses, side airflow is most widespread for engine and transmission cooling and best airflow most typical for air conditioner cooling. If it’s not, there may be two motives – a negative electric fan or bad radiator fan switch. In common, I like these fans, they are certainly great for big old houses that struggle to heat up a area. To test this, let your vehicle idle extended enough for the engine to heat up. Preserve an eye on the temperature gauge. Radiator fan assemblies include structural, mechanical and electrical parts, so they’re a lot more expensive than most fans in your automobile. Whichever kind of electric heating you opt for, we often recommend seeking at the a variety of power providers’ tariffs to evaluate pricing as the expense of electricity can vary considerably pricing does not only vary between suppliers but also between the wide varieties of tariffs provided by every single supplier. It draws cooled water or coolant from radiator by way of thermostat. In automobiles and motorcycles with a liquid-cooled internal combustion engine , a radiator is connected to channels operating through the engine and cylinder head , by means of which a liquid (coolant) is pumped This liquid could be water (in climates where water is unlikely to freeze), but is much more generally a mixture of water and antifreeze in proportions suitable to the climate. The parts you want, like a Behr auxiliary fan assembly, are just a mouse click away when you get them from Folks who want the most from their vehicles realize that only the highest quality aftermarket and OEM components must be utilized for repairs and maintenance. So ask oneself this query: Is it worth it to drive a auto without a radiator fan. Natrad’s variety of electric fans offers an economical cooling remedy for vehicle radiators and condensers. Auxiliary fan assemblies facilitate the movement of cooler air into the engine’s coolant technique, particularly when the car is idle. I have a loop with 3 noctua nf p12 pushing fans and i have scythe karma low noise fans but low rpm as well (500 rpm) that i never use becasue they are not adequate powerfull by themselves.

Care ought to be taken to make sure that the flow of the coolant is not hampered by any obstruction. Replace yours as soon as feasible and avoid overheating or damaging your engine. Interestingly on the other hand, automotive cooling systems are not practically as important to the operating and ongoing maintenance of diesel engines. Beneath we have offered a summary of the electric heating options accessible on the marketplace detailing their pros and cons to assist you choose which selection is the ideal for your residence. If the fan fails to come on, it can lead to the engine to overheat. Then the fluid is circulated by the water pump unit, via the channels of your engines’ heavy metal block, through the rubber coolant hoses, which you must be simply spotted when peering into your engine compartment. On direct air-cooled engines this is not a concern for the bellows thermostat that controls a flap valve in the air passages. The radiator-cooling fan is specially created in such a way that it turns on when the temperature of the engine rises and stops when the temperature is regular. The writer explains that in order for car radiators in North Hollywood to get in as considerably coolant as automobile engines need to have, the hoses conveying the fluid need to be massive sufficient tightening the nozzles or joints also aids enhance efficiency by preventing leaks. They all have the same fundamental function, which amounts to drawing in additional air, but especially at low rpm situations and instances when the vehicle sits at an idle. Logically, nonetheless, the cooling fan keeps the cooling method at the optimal temperature to avert the hotter than standard engine temperatures, as pointed out above. An early strategy was to take advantage of an aircraft’s abundant airflow to replace the honeycomb core (several surfaces, with a high ratio of surface to volume) by a surface mounted radiator. You ought to make it your daily habit to verify the coolant levels in your radiator. These coolant hoses pass from their fitting on the engine in the end to the radiator. Much more simply they might be oil-water coolers, exactly where an oil pipe is inserted inside the water radiator. This will minimize the effective back-pressure against the flow of air, and at the limit of its efficiency will minimise the opportunity of the air stalling through the compressor blades. If the radiator does not have cool air blowing on it constantly, it will overheat at some point, so you’d need to have the perfect combination of climate and visitors to drive efficiently without a radiator fan. SpeedComfort, a radiator fan, claims to increase the radiator heating energy by 20% minimizing the warm-up time by 50% and reducing bills by 22%. Having a green cord for your cabinet cooling fan can support make confident that you only use your fan when it is required, for that reason utilizing much less power and creating some important savings. A TYC Auxiliary Fan Assembly aids a radiator in lowering the excessive heat of the antifreeze. Most electric fans come equipped with thermal-sensors that activate the fan when it reaches a hot temperature. Moreover, you will locate the anti-freezing coolant dripping in to a little puddle beneath your vehicle. The reality that radiator pipes are narrow indicates it requires less time for the antifreeze to cool down. This was a key limit on efficiency during the 1930s when the introduction of turbosuperchargers 1st permitted handy travel at altitudes above 15,000 ft, and cooling design and style became a major area of study. Design and style of Fan blades and Motor Assistance ribs in RFM is vital to increase Flow noise, i.e. Air cutting noise. You also need to have to verify and recognize any external leaks and damages to any of the elements of the cooling system that incorporate the water pump, radiator, engine coolant passages, heater hoses and heater core. If we’re talking what do you do with a limited space, there is also often the alternative to run fans on each sides of the radiator in series. The fan clutch is responsible for holding the fan to the engine and turning it. If this assembly burns, you would have to replace it with a new 1. Inside the cooling program, the coolant is sealed and it is below stress and that is why, in these conditions, the coolant will boil at about 120 degrees Celsius. Install the new radiator, with fan assembly, into the car. The radiator fan does not work permanently but only when the temperature switch, connected to the radiator indicates a rise in temperature above a particular set level.

In case you notice the engine generates heat quicker, there must be something wrong with the cooling mechanism and it wants upkeep. The engine of a vehicle has a combustion chamber exactly where continuous explosions take location and as such the engine heats up very speedily. A radiator is responsible for handling extra power or heat that the engine produces to perform nicely. Cooling fans are categorized by cubic feet per minute (cfm) ratings. A corroded or damaged radiator can rapidly grow into larger difficulties for your cooling system and your engine. The excessive heat of the engine compartment and harsh elements of the road also contribute to premature failure of radiator fan components. The radiator caps are a essential part of the cooling program and are prone to fatigue and wear, and this may possibly lead to loss of stress control. Consider two cooling systems that are otherwise related, operating at an ambient air temperature of 20°C. These fins heat the air that moves more than them and cool the oil as they cool. First check the fuse to the cooling fan, if undesirable, replace it. When the automobile is obtaining hotter than standard and the fan need to be on, unplug the fan wire. Expense of the fans aside, push + pull on radiators has usually worked fairly well and a excellent way to get a bump in functionality with out increasing noise also a lot far more. Some of the greater electric fans can push over three,000 cubic feet of air per minute and have ten blades. Soon after you have repaired the leaks, it is advisable to refill the cooling method with a high high quality coolant. This part controls airflow and minimizes the effort your fan has to make in order to support your cooling system. The radiator’s job is to preserve the coolant cool so that when it returns back into the engine, it is able to absorb much more heat. Most of the fuel power in a car is converted into heat (approximately 70%), and it is the job of a car’s cooling technique to take care of that heat. An electric element is concealed within the radiator, which heats up and radiates heat out evenly from the front of the radiator. The auxiliary fan assembly improves air circulation via the radiator so that the coolant is effectively cooled. Their primary advantage is that they are simpler to repair than the not too long ago manufactured radiators. Aside from the radiator, the cooling program is composed water pump, freeze plugs, head gasket, thermostat, hoses, heater core, fan clutch and radiator fan. As you would know, all internal combustion engines make power by burning fuel and this energy drives the wheels of your auto. The objective of the radiator in your Nissan Altima is to keep the engine from overheating. The cooling system comprises of: the radiator, radiator fan, water pump, thermostat, stress cap, bypass technique, hoses and heater core. If the thermostat is broken, it can not signal the radiator to cool the engine down at the acceptable time, thus causing the engine to overheat. These could be either oil-air radiators, as for a smaller sized version of the primary radiator. Radiator Cooling Fans transfer heat blown by way of it by the fan. Several tubes are arranged parallel and the superheated liquid flows from the inlet whilst the fins conduct the heat from the tube and transfer it to the air, blown by the fan through the radiator. Usually, there are two kinds of cooling systems employed in a auto: liquid cooling and air cooling. An evaporative cooling method may possibly operate among 80°C and 110°C, which at first glance seems to be significantly less temperature distinction, but this evaluation overlooks the huge quantity of heat energy soaked up throughout the generation of steam, equivalent to 500°C. The flex fan has gained reputation in the higher-functionality auto and racing circuit. Absolutely everyone who has utilized an electric heater knows that they dry out the air. The most affordable explanation was that the fan that came mounted on the radiator just was inadequate to the process of pushing sufficient air by way of it. Make the most out of all the heat generated by your radiator with this Standard Radiator Fan from Radfan, which will not only leave you feeling cosier but also save you income in the lengthy run. The Valeo auxiliary cooling fan is an electric fan that pushes outside air over the radiator to hold it cool. Keep your heating bills in verify by making the most of the warmth your radiators pump out. My replacement heat sink is a Nactua NH-D9DX i4 3U (not an affiliate link), selected because it’s got good cooling capacity and it does not overhang the ILM (that is, it goes straight up, and the memory that’s next to the ILM will not trigger a clearance issue).

Since fan operation is normally not necessary when the car is operating at a speed of 25 mph or higher, the fan blade is attached to a clutch that disengages the fan to lessen noise and save fuel. An overflow tank that runs dry may possibly result in the coolant vaporizing, which can lead to localized or common overheating of the engine. The filter is mounted within a hot spot and tends to fail, defending against the cooling fan from operating. An electric fan operates independently, controlled by a switch at the engine thermostat. A convection heater has coils that will heat up and a fan that will blow the air into the space you want to heat. Surface radiators have also been utilised by a couple of higher-speed racing vehicles, such as Malcolm Campbell ‘s Blue Bird of 1928. It is crucial that the thermostat opens and closes to regulate the engine coolant temperature. Check to see that you have engine coolant and that it is the color it must be (what ever color it is when it is new). Motorists who require to replace radiators in North Hollywood vehicles generally visit radiator shops about town, hoping to discover the replacement element they need in stock. Alternatively, if you operate full time and do not require heating for the duration of the day, storage heaters could not be the ideal selection as heat will be emitted even when you are not there, resulting in unnecessary energy wastage. The toughness of aluminum also makes it a dependable material for use in vehicle radiators. All automobiles for numerous years have employed centrifugal pumps to circulate the engine coolant due to the fact natural circulation has extremely low flow prices. We have radiator fans appropriate for common passenger cars which includes aftermarket, upgrade, and direct original equipment replacement models. There are a lot of causes of overheating, including insufficient coolant, cooling fan cooling the coolant has failed, thermostat failure, and coolant temperature sensor failure. Electricity was utilized to empower the fan motors and due to the scientific design and style of fan blades we get the breeze a man produced phenomenon similar to wind creation. These steps center on one particular particular component—the radiator, which is the element that cools a car’s engine to prevent overheating and seizure. The thick population density has no mercy for cars overheating in the middle of the road due to a malfunctioning radiator. Lowering drag is a main purpose in aircraft style, such as the design of cooling systems. All these auto parts have unique roles to perform thus the absence of one particular could significantly impact the entire cooling process and of course, the engine’s efficiency. But the catalyst would be the radiator fan, for with no it the radiator won’t execute as it is design to do. Then, a malfunctioning cooling program will trigger a chain reaction of harm to the engine triggered by overheating. Most mechanical fans mount on the water pump shaft and are driven off of the crankshaft with the exact same belt and pulleys that turn the water pump. The fans are all permanently fixed to the acrylic template beneath with a foam gasket so the fans are installed, run, and logged precisely the exact same on each radiator. At that point the radiator fan speeds are improved to 1400RPM and heat load to 200W and the test is repeated. For mechanical fan automobiles we have fan blades, thermal and non-thermal fan clutches, and electronic fan clutches for extreme duty applications. Putting the fan along with its electrical motor in front of the radiator guarantees that the motor remains as cool as attainable. But the 1 responsible for conveying the air to the radiator to cool down is the Mercedes fan blade. City site visitors and idling are rough on your engine with no a functioning radiator fan. As it was pointed out just before, there are mechanical and electric cooling fans. Low profile fans pull substantially significantly less airflow by means of the radiator cores than a higher-overall performance fan. The 1st thing you ought to do is to check all the elements of the cooling system. When the engine rpm has lowered enough, the sensor picks up the signal and engages the clutch, which locks with the fan. When longer the water tank is used, the more internal scale will develop up, resulting in poor heat dissipation in the radiator. Given the radiator’s value in maintaining engine temperature, a faulty one ought to be replaced with out delay. The radiator fan cools the engine while the condenser fan increases air-conditioning.

If not, you may possibly have a thermostat sticking or low coolant. The most typical symptom of a failed thermostat is overheating at highway speeds. This will give you access to the electrical connectors as nicely as the lower radiator hose and transmission cooling lines on the automatic. These use a sound state relay for your cooling supporters, as well as relays tend to overheat and fail. The cooling fan draws cooler air via your radiator when your car is not going quick enough to bring it by means of the front. For troubleshooting, the engine need to be checked if it is overheating, the cooling fan need to be observed closely if it switches on when the engine temperature exceeds from standard. These engine-cooling fans are utilised in numerous applications in addition to the automobiles, like street rods, passenger automobiles, trucks, racecar water radiators, oil coolers and differential coolers. These fans run constantly, utilizing far more engine power to cool the radiator. For this explanation, automotive technicians often advise operators to turn on the heater and set it to high if the engine is overheating , to assist the primary radiator. A excellent way to check it is to really feel the upper element of the radiator hose when the car is warm. If the radiator fan fails or is not operating correctly, your automobile can get seriously broken, and repairs would expense thousands of dollars. Your Natrad specialist can assist you to pick the correct radiator cooling fan for your car. The coolant then flows from the inlet to the outlet by way of many tubes mounted and arranged in a parallel pattern. The fan clutch also minimizes noise by slowing down or disengaging the fan at higher way speeds, and a few even help speed engine warm up all by means of cold climate. Automobile radiators are constructed of a pair of metal or plastic header tanks, linked by a core with a lot of narrow passageways, providing a high surface region relative to volume. Practically all the radiator fans have four to six blades, which rely upon the size of the car. Lastly the most critical consideration is going to be the size you have to perform with in the automobile or the size of the electric fan and how it all fits together. The activity of the VDO Auxiliary Fan Assembly is to improve air flow to the car’s energy plant. A pusher-style fan can be used as an auxiliary cooling source, but you need to positive make the fan covers as a lot of the radiator core as achievable. Eliminate the electric fan by removing the two little bolts (8MM heads) that connect the fan to the radiator cross member. In the event that a vehicle’s cooling method ultimately provides way, a motorist need to be prepared to purchase a replacement radiator. Blowing cooler outside air via the radiator, if the fan does not operate appropriately temperatures could rise up to 50%. A single huge fan will provide better airflow than two smaller fans. If motorists fail to add an adequate quantity of antifreeze, the resulting frost that types within the radiator can lead to critical internal harm to the entire assembly, as well as worsen engine heating problems. At beneath £50 these are absolutely worth thinking about if you reside in an older house or really feel that you need to boost your heating efficiency and overall performance. I also tested with the radiators in parallel flow, but I lost some of the information and got the rest mixed up, so I’ll have to redo those tests. Individuals appear to have an concern with the efficiency of the fans themselves, being also little to move a decent quantity of air. During highway driving, most cooling systems use a forced air ventilation apparatus to keep air movement over your radiator fins and cool down your engine. A clogged radiator might be the purpose your engine is overheating. SpeedComfort increases the heat output from your radiator by a factor of two and is so energy effective that it only makes use of around .9kWh of electricity per year, that is less than £0.15p in actual income. So which is far better for your application, well most cooling system makers or radiator manufacturers will inform you that puller designs provide a tiny a lot more efficiency, so if attainable go with the puller style especially if that is your primary coolant supply. Coolant leaks can result in poor overall performance, overheating engines, and sludge inside the radiator. Here, I only tested the optimal flow-version (airflow from cooler to warmer rad). The principal function of a fan is to circulate the air in the area producing the location cooler on the hot summer days and warmer on winter days.

Water pump is one of the important components of the cooling technique of a vehicle. A fan’s job is to pull air via one thing, this some thing will ultimately generate a restriction or a pressure drop. This can also be the dilemma if the gauge stays low and the automobile in no way heats up. If the temp gauge is reading low but the two radiator hoses are warm, the temp sensor may not be working. This kind of radiator is especially excellent for folks with dust allergies as their flat panel makes them effortless to clean and they don’t “convect” heat or promote air circulation to heat a space these factors assist to lessen the quantity of dust being circulated around a area. The intense heat generated by the car can just burn of your engine, which will eventually result in the breakdown of the auto. Our range of fans can be utilized for cooling radiators, oil and transmission coolers, condensers, evaporators, heaters, CAC’s, batteries, and ventilation. When searching in to the problem of the overheating of a car, the air conditioning compressor demands the cooling fan operating in idle mode as extended as the car’s compressor is on. To check if the car’s cooling fan is functioning, the air conditioner has to be switched on. Its switches on collectively with the car’s air conditioner compressor. As the vehicle moves, the air getting into by way of the grille of the auto cools down the heated antifreeze contained in the radiator. Natrad has a complete range of overall performance cooling components, such as fans that give important air flow to engine operating beneath stress. 1,591 car radiator fan stock pictures, vectors, and illustrations are available royalty-free of charge. Puller-style fans are suggested for applications in which the electric fan is the main cooling source. I explained that each and every cooling program element was new, and that the technique had been bled numerous instances. SpeedComfort can even be utilised with electric, cast-iron and designer radiators by utilizing the Clip-On Feet to raise the SpeedComfort 25mm (1in) off the floor under your radiator. I have been a huge fan of zoned heating from the likes of Genius , but this doesn’t aid the performance of the radiator in each space. At this time, verify the tightness of the fan belt and whether the fan blades are deformed or broken. GM Original Equipment Engine Cooling Fan by ACDelco®. The fan then begins blowing air across the radiator thereby complementing the waterbased-cooling of the radiator. The liquid coolant that passes by means of the engine absorbs all the heat developed, maintaining the engine temperature under manage. The fan clutch technique saves horsepower from the engine by taking away unneeded drag. All automotive radiators, whether in automobiles, trucks, buses and tractors, use the exact same principle even though functioning. The auxiliary fan assembly is found directly in front of the radiator and blows chiller outdoor air previous the radiator fins. Directing water to circulate only by way of the engine permits the engine to attain optimum operating temperature as rapidly as attainable whilst avoiding localised “hot spots.” When the coolant reaches the thermostat’s activation temperature, it opens, enabling water to flow by way of the radiator to avert the temperature rising larger. Item Note: Electric Fan Kit – Universal Match Primary cooling fan. Beneath is numerical information of a SPAL fan showing what is known as, in the cooling industry, a fan curve. Therefore the hot antifreeze coolant carries the engines’ waste heat from the engine directly into the radiator where the air flowing (or drawn by the working rad fan) expelling, diluting and exhausting waste excess heat from your vehicles’ motor into the nearby air. To stop the engine from overheating , we take the help of coolants that flow via a radiator into the engine. Most respected mechanics would suggest that any time your radiator requirements repair that you replace it. The price distinction is not great unless you’re repairing the radiator your self, and your possibilities of obtaining to make the repair once more in the future are mineralized. The fan in most auto models is installed in front of the radiator. On pre 1991 Jeeps with out a radiator cap, it is helpful to eliminate the temperature sensor at the back of the head to let the air escape. When you discover an internal leak in the cooling program, do an internal leak test by employing a stress tester to check if there is any combustion gas leakage. Heat is the number 1 enemy of mechanical components and even if vehicle engine’s is designed to manage these outstanding high temperatures, if these levels get out of manage, the engine will definitely break.

This might sound like a main benefit, but any time you repair a radiator, you decrease its capacity to cool. We can supply a wide variety of high quality SPAL axial cooling fans , centrifugal blowers and linked accessories at competitive rates all available with worldwide delivery. Electric radiator fans are available in each pusher and puller styles. Call Kirk’s Auto Care in Livonia, MI, at 734-402-8722 to discuss your radiator fan difficulties. Even so, when I drove the car to the Lotus Owner’s Gathering (LOG) in August, despite my possessing installed a switch to straight turn on the fan and not rely on the temperature sensor, the car overheated in dramatic style even though I was waiting in the queue to get into the concour, held at Thompson Motor Speedway in Connecticut. Heat transfer from the radiator to the condenser can alter efficiency, if the vehicle is overheating. To increase air flow by way of the radiator – in an impact to get more cooling power out of your rad system a fan draws air by means of the fins or tubes on the radiator itself. To do this keep the radiator cap open, start off the car, and place the heat on max. A radiator fan is hence utilized to maintain the temperature of the coolant in verify. Radiators in North Hollywood automobiles nevertheless face a danger of experiencing meltdown, even in spite of the reasonably reduced temperatures of fall and winter. These radiators have been not as sturdy as contemporary radiators, nor did they cool as properly as modern day radiators. The GTs just have a special fan blade that appears to bury practically all air variety noises into the radiator which is very good, but it also tends to have a tiny bit of bearing whine and the motor noise is present maybe a bit more than other fans. This post aims to give clear info and details to aid you choose the electric heating solution that very best matches your distinctive lifestyle and heating demands. Nonetheless, frequent overheating episodes are signs that there is something incorrect with your cooling technique. We checked to be particular the front-mounted radiator fan was spinning the appropriate way. The radiator transfers the heat from the fluid inside to the air outside, thereby cooling the fluid, which in turn cools the engine. Auxiliary fan assemblies enhance the circulation of cool air into the car’s cooling method, particularly at instances when the vehicle is stopped. This way, the second rad acted as an Airbreak” in front of the fans and I could see how considerably of an effect this would have on temperatures. As the heated coolant moves from the engine block to the radiator, it gets cooled because of the aluminum body of the radiator that dissipates the heat. Before coolant was used, water was poured into radiators. Radiators initial used downward vertical flow, driven solely by a thermosyphon effect. It need to open and permit coolant to pass once the engine is adequately heated. 12. Bleed the cooling system to guarantee that all air pockets are removed. There are also mesh styles of fan guard for your electronics or cabinet cooling fan, which can be valuable also based on your specific needs. RadFan performs a little differently simply because it blows the warm hair horizontally into the room, with the aim to stay away from it cooling as the air passes more than the cold window. The engine delivers energy to run the automobile but it is the radiator that maintains the well being of the engine. I cannot comment on actual efficiency functionality, it would take months of testing, but as far as heating performance goes, there is absolutely an improvement. Less commonly, power steering fluid, brake fluid, and other hydraulic fluids could be cooled by an auxiliary radiator on a automobile. The radiator has tubes that include large quantity of water and has fin region to allow outdoors air to pass by means of. Automotive radiators have been instrumental in keeping the heat developed under handle. Routine checks can assist in keeping the vehicle’s cooling system. The place of the radiator is of extreme value allowing it to perform its major function i.e. cooling the engine. Radiator caps for pressurized automotive cooling systems. Item Note: Cooling Fan Assembly with Shroud – Includes control module. Firstly as a belt driven fan is only going to spin as quickly as your engine low finish rpm cooling skills so is not fairly as great as it would be with an electric fan where the airflow is a lot more constant. When the engine is switched off, the cooling program cools and liquid level drops.