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Radiator fan starts when car is on dosent switch of until car is of is that normal

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Yes

Posted on Mar 23, 2011

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How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

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Car starts to overheat at idle - returns to normal temp when driving ,elec cooling fan works. could it be something as simple as rad. cap?loosing cooling fluid, but no apparent leaks.


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If the switch to run the fan does not turn it on until the engine is too hot, then you probably need a new fan switch.

I might think that the fan only covers a portion of the radiator, and there is only sufficient cooling surface area when the whole radiator is involved, but the fact that moving the car generates so much more heat than idling does would seem to counter that idea.

If you were losing (not loosing) coolant, there would be problems while driving as well.

It is also possible that your radiator's coolant flow is barely adequate, due to clogging. It might be a good idea to have that professionally checked.

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My check engine light has been on for 2 days now and there's some sort of loud fan that starts up whenever I start my car and it runs constantly until I turn the car off. It makes it embarassing to pull up...


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Cooling/electrical


How long does it remain on for?
This is quite normal. It should switch of once the radiator temperature drops..

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