Radiator fan in not working even when i can feel the heat of the engin on my legs what is its working condition can u please explain or there is some technical problem in my bike yamaha r15 ([email protected])09233182187

How does a car radiator fan work?
The engine cooling fan is designed to move air through the radiator when the vehicleis at slower speeds or stopped. This air flow removes heat from the coolant created by the engine using the radiator as a conductor. An engine cooling fan is temperature controlled to only run when needed.26 Jan 2017

How Radiator Cooling Fans Work Explained in Under 5 Minutes

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thermostats are always a common culprit for over heating but outer items like poor fin condition on the cores , blocked or partially blocked cores, lack of anti freeze -anti boil coolant, coolant fan not working. timing problems with the ignition, air -fuel ratio not right (too lean) gear selection ( OD not working) fan belt loose. A simple test for a thermostat operation is to start the engine cold and time how long it takes before you can feel hot water in the top radiator hose . 10 minutes at idle would be about right and if you feel the hose start to get hot then the thermostat is opening

Hi
Do you have a bleed valve on or around radiator / radiator pipes.
if yes the undo the valve and leave the car running till it bleed.
once its bleed, you will have full circulation of the water and both pipes will heat up also the fan will come on.

If no bleed valve then undo the water bottle or metal cap.
start the car up and leave it running till the fan kicks in. it will only kick in when the system is bled and no more air in the system.
Thanks

Many vehicles are set up to run the radiator(/ac condenser) fan whenever the air conditioning is on. Might this be the case here - is the air conditioning on when on the open road? Just a thought.

Most cars have an 2 electric fans on the radiator. One will run when the coolant gets hot and the other will run when there is more cooling demand OR it will run when the AC is turned on. My guess is, the second fan is not running when your AC is. Your AC system creates heat of its own. The heat is removed through the condenser (radiator-like coil) which is usually located in front of your engine radiator. Without a fan the heat is transferred into your engine radiator causing it to over heat. This would explain why it overheats while idlling and not while driving. While driving, air is flowing through the radiator and condenser. to provide the necessary cooling. In short, check to see if both fans are running when the engine is hot and the AC is turned on.

The only next logical step is to have the radiator flushed and cleaned. Over time the radiator slowly builds up deposits along the fins and reduces water flow and heat dissapation. Sometimes Iv'e seen radiators get so full of deposits that only half the radiator is actually working. I have also seen this motor in other GM applications have computer problems and the cooling fans won't run when they should, but when this happens you start to see other funny stuff happening that gets hard to explain till a bad cumputer gets diagnosed. I assume everything else on the engine and car is working fine and your not noticing any other strange behavior from the engine, like hard to start sometimes and other times it starts fine, air conditioning fans work and then they quite and then work again for no apperent reason. If these type things are happening you might want to make sure your computer is working fine, and all the relays are working. Also make sure you do not have any abstructions in front of the radiator blocking air flow. there is also a sensor on top of the plennum that tells the fans to kick on, check this also.

Hello,
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Let me explain in layman's terms how the air conditioning (AC) system works and what could be happening to your car.

Like your body, the air conditioning compressor is the heart of the AC system, and Freon is the blood. The compressor pumps Freon throughout the AC system, either the older type R12 which costs as much as gold it seems these days, or the new environmentally-friendly R134A Freon. This Freon is a gas and liquid combination that is compressed and circulated throughout the air conditioning system. The compressed Freon is pushed through the system under pressure and is passed through different sized metal and rubber hoses and a special valve called an expansion valve that cause the gas to expand and contract.

This expansion and contraction makes the Freon gas very cold. This cold gas makes its way via metal lines into the dash area of your vehicle to the evaporator core. This evaporator core is like a small radiator, except it has cold Freon circulating inside and not hot antifreeze. A small fan (the AC blower fan which you control from the control panel on the dash) sits in front of the evaporator core and blows air across this cold evaporator and then through the vents inside your vehicle.

The other objective of the air conditioning system is to remove the heat from inside the cab of the vehicle. This heat is removed by the Freon with the help of the AC condenser located at the front of the car (usually in front of the radiator). The Freon coming back from the evaporator carries the heat from the cab to the condenser via rubber and metal hoses. Just like your radiator, the condenser is lightweight aluminum with many internal winding coils.
The Freon travels through these coils, and in between these coils are small slits or fins that the Freon is forced through. The condenser will have an electric cooling fan mounted in front or behind it to push or pull air through these fins to remove the heat from the Freon. Some vehicles still use the old fashioned fan blade driven by the engine to pull air across the radiator and the condenser.
Now I know that is just a tidbit of information on how the air conditioning system works, and it is very general, but I wanted you to know what to look for to give you insight as to what might be happening with your vehicle.
A few causes of low cooling efficiency or no cooling at all at idle are:

Lack of air flow across the condenser. Make sure the electric cooling fan motor near the condenser is coming on, or in models that are equipped with a fan blade make sure this fan is turning and is turning very fast.

Low Freon levels. Freon level and pressure should be checked by your certified air conditioning mechanic.

Overheating. If the engine is running hot or overheating, it can have a noticeable negative affect on the air conditioning system. Some cars have two electric cooling fans, one for the air conditioning condenser and the other for the radiator. Make sure they are both working properly. Usually at idle on a hot day with the AC on both fans will be on.

When the vehicle is traveling at freeway speeds, the compressor is pumping the Freon throughout the system much faster and harder than at idle. There is a dramatic increase in air flow across the condenser due to 55 mph winds, and the engine is usually operating at a cooler, more efficient temperature as well, thus allowing the air conditioning system to operate efficiently.
Note: An air conditioning system that is somewhat low on Freon can still feel comfortable at freeway speeds due to the added air flow across the condenser which can overcome the ill effects of slightly low Freon. Periodic air conditioning performance checks by your mechanic are the best way to keep the system in great shape.

Hope this helps.

Goodluck

Do you know for sure if the radiator fan comes on? It should be coming on for the a/c, and it should come on BEFORE the engine temp gauge begins to climb.

Also, do you have obstructions in front of the grill? I would think that you said no blockage to the air intake, but also I could think if you have a winch. Is there any chance you have mud/debris in the radiator fins?

Bugs would be in the a/c condenser. Have you looked at the engine radiator behind the condenser? It's kind of hard to see. You may have to remove the plastic cover.

Make sure the fan goes from low to high speed; when the jeep starts to get warmer the fan should go from the normal low speed up to high (you usually will know it because it really is humming out there on high). It may just be hot enough that low speed can't handle the heat load of the air-cond and the engine in traffic.

The air cond gets the air before the radiator so if the fan is coming on low it will keep the condenser cool enough to have decent A/C performance... the dealer should also be able to test low / hi radiator fan operation.

Tell us news, hope helps.

Sounds like the thermostat is stuck, not allowing hot water from the engine to flow to the radiator. Thus the engine is getting overheated and the radiator still feels cool.

ur car is overheating because it does not have the capacity to dissipate high coolant temperature from ur engine to ur radiator or heat exchanger/ check auxilliary fan operation/ if electrically operated check fuse or motor condition/ if no motor check fans silicone oil/ could be too less/ check radiator condition it coul be blocked that why it restrict coolant flow/ check thermostatic valve condition could be stuck up and restrict coolant flow to the radiator...check coolant reservoir if water has oil in it/ if it has oil in it then ur engine cylinder head gasket is broken....