ok so today I noticed while sitting my cars fan never came on and it just over heated. well I have power to the fan but when I jumped the fan to the battery it didnt do anything. so im pretty sure its bad but while idling my ac kicks on and off but when i drive my ac works great. does this sound like just the cooling fan causing all my issues? thanks for the help guys
My A/C does that too, cycles anyway, your fan should come on when idling if your engine gets hot.. I'm not exaclty familiar with how these ones work but I know my beretta was supoosed to shut the fan off at 40 mph anyway. I haven't looked at my condenser yet, it might be plugged causing my cycling problem but it hasn't bothered me yet
Jordan wrote:My A/C does that too, cycles anyway, your fan should come on when idling if your engine gets hot.. I'm not exaclty familiar with how these ones work but I know my beretta was supoosed to shut the fan off at 40 mph anyway. I haven't looked at my condenser yet, it might be plugged causing my cycling problem but it hasn't bothered me yet
Is your refridgerant level down? low refridgerant will cause the compressor to short cycle (orfice tube cycling clutch system).
dakota sutherland wrote:ok so today I noticed while sitting my cars fan never came on and it just over heated. well I have power to the fan but when I jumped the fan to the battery it didnt do anything. so im pretty sure its bad but while idling my ac kicks on and off but when i drive my ac works great. does this sound like just the cooling fan causing all my issues? thanks for the help guys
also check the fan ground and fan motor for a open before replacing the fan motor.
If your fan isn't working its likely the a\c high pressure switch is shutting down the compressor clutch power. without the fan high side pressure will build fast so the hp switch is protecting the system. Enough air is passing through the condensor at speed to keep the a/c pressure lower'
you are exactly right . fan motor was bad I fixed it. sad thing is , when I bought it the guy I got it from said the temp guage always ran at 3/4 which caused the fan to run alot. well motor blew up put a new motor in it and new thermostat and same thing a month later car started to run almost in the red but never over heated, I changed the thermostat with the same type and now it runs a little under half. so I conclude all the extra fan usage due to the heat of the engine probably wore the fan out quicker than if it woukd have been at the right temp. but live in learn atleast the fan motor is cheap
j fortier wrote:Jordan wrote:My A/C does that too, cycles anyway, your fan should come on when idling if your engine gets hot.. I'm not exaclty familiar with how these ones work but I know my beretta was supoosed to shut the fan off at 40 mph anyway. I haven't looked at my condenser yet, it might be plugged causing my cycling problem but it hasn't bothered me yet
Is your refridgerant level down? low refridgerant will cause the compressor to short cycle (orfice tube cycling clutch system).
My refrigerant isn't low. I have verified with manifold gauges the high and low side is at correct pressure, The AC is freezing going down the road... Its a heat transfer issue with my condenser. Possibly a fan issue but as of now, my car doesn't overheat, and I don't do much town driving so the AC isn't an issue. I have bigger fish to fry on this car.
Ok I have dealt with this a/c cycling problem on many cavaliers. I have found the culprit to be the wiring to the plug on the intake air temp sensor (IAT) its the little sensor that hooks in to the intake air boot connecting your air filter box with the throttle body. it has two wires going to it. (problem being if this sensor reads too cold or and open circuit it will say its too cold for the a/c compressor to run and will not activate it) the wires usually right at the plug are bad. With the a/c turned on wiggle and pull or push slightly on the wires close to the plug. If the compressor stays off or on while you are holding the wires a certain way then you need a new plug and pigtail harness for the IAT sensor.
