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