Operating the fan is a decision with many variables, and in a well-designed system it happens when hot outside and not moving, and perhaps after a delay (the radiator doesn't get hot immediately). There are a few simple reasons that the fan would not be cycling on. Other than that, the AC system could care less what the engine is doing. The AC system depends upon being able to dissipate heat into the engine coolant. Aside from a bad fuse, relay, or just a bad fan motor, what else can cause it to not turn on when the AC is switched on in my car? However, there are some preliminary steps you can take to rule out other possible causes for your AC not working and confirm that the problem is, indeed, with the AC fan … They look ok. My 2013 Hyundai i10 has one fan and as far as I can see one coolant temp sensor. Remove air conditioning relay. If it were low on refrigerant then perhaps the low pressure switch will cause that orange light. Only time it works is if i unplug the coolant/Engine temperature sensor. Today i found, Cooling fan does not turn on even after reaching operating temperature.Engine overheats when idling. Radiator fan testing points. When I turn on the ac the fan works and keeps the car cool. It does not turn on, when A/C is turned on ( I realized AC is also not working on my car, it may be related or not). Fan spins after engine shut-down might indicate a weak clutch. A fan clutch works by tightening up and pulling more air through the radiator as the cooling system heats up. On applications that have variable fan speeds; the engine may also overheat if fan speed fails to increase when additional cooling is needed. See Contact Test in Step 1. These clutches are featured on forward facing engine's only and are used in place of an electric fan though they do the same job. If the AC fan motor is bad or the capacitor is faulty, you should always contact an expert HVAC technician to repair or replace parts. it is loc on the side of the radiator. If this happens, inspect the cap to see if there is any damage. Auxiliary Fuse Panel: Fuse 3 - Driver's Side Cooling Fan Fuse 5 - Passenger's Side Cooling Fan. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. Silicone fluid leaking from the fan clutch would cause this problem. Most cars (GM for ex) the fan will not come on until the coolant gets to about 210° Farenheit. This engine works continuously while the car is running. I've already checked fuse, relay. One or both fans will not run. Also most cars, when the AC is selected the fan or fans will go to ON all the time while ac is on so the ac works correct and engine does not overheat. If the motor fails the blades will not be able to spin or generate air flow. When the ac is of the radiator hoses both become same heat after a while and the overflow reservoir starts boiling over and the fan do not kick in. When there is not enough air flow through the radiator, this causes blockage in the fins, and as a result, the car overheats when AC is on. Cadillac STS Radiator Fan Not Working Causes. Well before then, when the old one was still in the car, my car would heat up while i was sitting still and it was drinking coolant and water like crazy!!! Unplug the radiator fan connector. Why wouldn't the engine over heat if the fan wont spin, and why would this problem cause the ac not to work… The cooling fan motors work together with the cooling fan blades to pull air through the radiator. Therefore, it can wear out easily. Check your radiator fan. To ensure optimal performance and lifespan, your engine must not overheat. This can cause bearing damage, radiator damage if the blades flex too far, or even shatter a plastic fan. AC compressors endure a lot of stress. The radiator has alot to do with the ac although tha's most likely not your problem. The AC system is a completely separate entity; the only connection it has to the engine is at the compressor pulley, which derives its power from the crankshaft. If the fan does not come on, something in the control circuit is defective. Absolutely, the more air thru your condenser the more efficient your a/c will be. The Radiator Fan Motor. A bad fan clutch will slip and not spin freely and thus not pull the air through the radiator dissipating the heat. Fuses 22 and 26 are not marked as radiator fan fuses in my Owners Manual; they are AC and Power Window respectively. Other cars the cut in range may be lower. If the fan does not turn on, you will need to replace it. 1996 Chevy Cavalier 2.2 lt engine. It might not be coming on. 12 – A Bad Fan Clutch Will Spin but not Pull Air Through the Radiator. Many other issues can cause the engine to run hot or overheat. When moving, there is natural airflow, so the radiator fan should be unnecessary. I discovered my electric fan was not working on my 2000 328i (Manual). Engine Cooling Fan Issues. Bad fan motor. When a fan clutch goes bad there can be is a loud roar. Also Know, does radiator fan affect AC? I replaced water pump and radiator and coolant temp sensor. I didn't realize there is a mechanism that would make it not spin just because of low freon? Bad Car AC Compressor Symptoms. The three parts that commonly cease working after the radiator goes bad are the thermostat, water pump, and heater core. He can run a hose on the radiator and the air is cold but the truck doesn't over heat. If fans stop, AC relay is most likely bad. I heard that low freon can cause the condenser fan to not turn on. Although the fan itself can go bad, that’s definitely not the place to start a diagnosis. Is this true? 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