some times the fan will not work if the radiator fan sw is bad. Although the fan itself can go bad, that’s definitely not the place to start a diagnosis. I heard that low freon can cause the condenser fan to not turn on. He can run a hose on the radiator and the air is cold but the truck doesn't over heat. @ Tallra1 I already checked the wirings, and its all in good shape, but i havent check yet the main thermo-switch. If fans stop, AC relay is most likely bad. There are a few simple reasons that the fan would not be cycling on. To ensure optimal performance and lifespan, your engine must not overheat. If the fan does not turn on, you will need to replace it. I discovered my electric fan was not working on my 2000 328i (Manual). As it happens, there are many things that can go wrong, so let’s look at some possible issues that can affect the working of radiator fans, starting with. Fuses 22 and 26 are not marked as radiator fan fuses in my Owners Manual; they are AC and Power Window respectively. However, there are several components that could cause the radiator fan to stop working when they fail, even though the fan itself may be in perfect working condition. Cadillac STS Radiator Fan Not Working Causes. Even if you live in Florida, Texas or California, these days you need your car's defroster to work properly to fight those early morning chills, and if you live up north a working heater can be a matter of life or death. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. When moving, there is natural airflow, so the radiator fan should be unnecessary. 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). I wanted to test which part of the system wasn't working before I dropped $300 on a new fan. The vacuum won’t be released by the radiator cap properly and it will cause the radiator hose to collapse during the cooling down period. This issue occurs when there is not enough airflow through the radiator. I drive the car 10 minutes and then it goes warm again, leave it off for 10 minutes, turn it back on and its cold again, radiator fan works fine, but i noticed that one of the radiator hoses is warmer than the other, someone told me could be the thermostat making issues. Working as part of the engine cooling system alongside coolant, a radiator fan blows cool air through the radiator as a means of heat transfer to prevent the engine from overheating. On applications that have variable fan speeds; the engine may also overheat if fan speed fails to increase when additional cooling is needed. If there is, replace it immediately. 2. The three parts that commonly cease working after the radiator goes bad are the thermostat, water pump, and heater core. They look ok. This produces the hot air that gets blown into your car. Why wouldn't the engine over heat if the fan wont spin, and why would this problem cause the ac not to work… Trying to work out why your car heater isn't working and why the car heater is blowing cold air when it should be hot? If either is blown, those other functions wouldn't work as well, so they might not be faulty, but probably worth checking them in … this is like a oil presure sw when it get to the right temp the fan sould start up. Absolutely, the more air thru your condenser the more efficient your a/c will be. If the motor fails the blades will not be able to spin or generate air flow. Read on to see what causes a car heater to blow cold air. I'd expect if it was low, it would cycle on and off and not get cold, unless of course it … So what can go wrong? A bad fan clutch will slip and not spin freely and thus not pull the air through the radiator dissipating the heat. Bad fan motor. If the fan does not come on, something in the control circuit is defective. This can cause bearing damage, radiator damage if the blades flex too far, or even shatter a plastic fan. The radiator has alot to do with the ac although tha's most likely not your problem. See Contact Test in Step 1. Remove air conditioning relay. Figure 3. Unplug the radiator fan connector. Over a certain number of years, this stress will wear down the compressor and cause … 1996 Chevy Cavalier 2.2 lt engine. 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. So, i have a 1996 honda accord, i just had a new alternator put on yesterday. Your cabin heater relies on the hot coolant that passes through the core. This was after many of their buyers experienced the same problems that were then associated with a fault in the cooling fan module. Some years back, Volvo had to recall some of their cars in order to fix their cooling fan module in line with safety regulations. @johnblack I checked it while it is on cold state, but then when turn the AC ON the Radiator Fan turn on, so I let the AC ON while i drive my car, after 30mins driving if i turn the AC OFF, the RADIATOR FAN still dont work, even the Radiator Temp was hot. A sticky thermostat, blown head gasket, or plugged radiator could cause this, especially if anyone put in radiator stop leak. I didn't realize there is a mechanism that would make it not spin just because of low freon? Bad Car AC Compressor Symptoms. 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. Is this true? 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. The relay transmits the electricity coming from the battery to the motor of the radiator fan. I replaced water pump and radiator and coolant temp sensor. My 2013 Hyundai i10 has one fan and as far as I can see one coolant temp sensor. When one component fails to work properly, other parts throughout the cooling system also run the risk of failure. 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? The AC system depends upon being able to dissipate heat into the engine coolant. Under most circumstances, a bad thermostat will not have any effect whatsoever on the air conditioning system. Since car air conditioning systems get turned on and off constantly, this power fluctuation puts a lot of stress on the compressor. Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running. Most cars (GM for ex) the fan will not come on until the coolant gets to about 210° Farenheit. Replacement may be necessary if it’s not working right. You may have a bad radiator cap if the radiator hose collapses. A defective thermostatic switch could make the fan run continuously, reducing the coolant temperature to the point where you can’t get enough heat into the interior. Radiator fan testing points. 12 – A Bad Fan Clutch Will Spin but not Pull Air Through the Radiator. I was thinking that maybe i was having a head problem, but i didnt see any tell tale signs of coolant leaking over into the oil. Here are the most common reasons that your radiator fan does not turn on: 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). Here is what I found: One main thing to point out is the Manual version of the car has a single electric fan on the engine side of the radiator. When this happens, the radiator’s cooling abilities drastically decrease. A fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. Also Know, does radiator fan affect AC? 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!!! When a fan clutch goes bad there can be is a loud roar. Does that sound right to anyone? Run jumper wires between the connector's two electrical terminals. Fan spins after engine shut-down might indicate a weak clutch. Engine fan: Most vehicles today have a thermostatically controlled electric fan that comes on when additional engine cooling is necessary. Bad fuse or fuses. Silicone fluid leaking from the fan clutch would cause this problem. The Radiator Fan Motor. 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. 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 … Other than that, the AC system could care less what the engine is doing. Yes, a broken radiator fan can cause the air conditiong to stop working. it is loc on the side of the radiator. However, a bad cooling fan relay isn’t the only culprit for excessively high engine temperatures. When I turn on the ac the fan works and keeps the car cool. The cooling fans don’t work. The guy calls back and says the fan clutch for the radiator is bad. I've already checked fuse, relay. AC compressors endure a lot of stress. Many other issues can cause the engine to run hot or overheat. Today i found, Cooling fan does not turn on even after reaching operating temperature.Engine overheats when idling. The AC was working perfectly though right up until that prior day, I was using it the day before. Check your radiator fan. Without its proper function, the fan either does not work at all or works so slowly that the coolant cannot cool down properly. If this happens, inspect the cap to see if there is any damage. If the radiator fan is in working condition, move on to the next step. Excess fan noise at high speed is caused by the same problem, a seized fan clutch. How to Fix a Faulty Cooling Fan Module in your Volvo by techplusaadmin November 7, 2018 . A fan clutch works by tightening up and pulling more air through the radiator as the cooling system heats up. Another noticeable sign of a bad radiator is when your heater doesn’t work as it should. A fan clutch is designed to cool the engine when it becomes too hot and on the verge of overheating. Passenger heater not functioning. 6. This engine works continuously while the car is running. Other cars the cut in range may be lower. If your radiator is plugged it could run hotter than normal and cause the ac condensor to run warmer which in turn could cause the ac to run a higher high side pressure which will affect the cooling. 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. If it were low on refrigerant then perhaps the low pressure switch will cause that orange light. Disconnect electrical connector at fan and take resistance readings on fan motor. 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. Auxiliary Fuse Panel: Fuse 3 - Driver's Side Cooling Fan Fuse 5 - Passenger's Side Cooling Fan. It might not be coming on. 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