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The cooling fan (radiator area) in my 2000 Jeep Grand Cherokee is not working. I believe that the control relay has failed. I'm don't know where the relay is located - under the hood. Can you help? NRL 6/3/09
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Typically you need to replace the fan clutch. (This is presuming that you are not overheating and not near too hot. Under hot condition, your issue is normal.) The clutch can fail in the locked position.
According with your other quesions, the DTC P1491 code is actually radiator fan control relay circuit. Soft reset if the battery disconnect would have erased the code; the first thing I would replace for that code (fan relay). Additionally, its possible thta your THEFT system is activated, check owners manual to disarm. Check details here: - Grand Cherokee fuses
If the fans don't come on to cool the radiator then maybe it's the thermal fan switch, which sends the turn on signal to the fan relay, that might be bad.
Either your temperature sensor is unplugged or it has failed and is giving you that reading. (most likely cause...if not, start checking wiring from the sender and make sure any electric cooling fans are plugged in as well.
Check your relay. I believe one of the terminal connections is an always hot connection. If your relay has gotten stuck in the on position, it will cause your fans to remain on.
When the engine is at operating temp check the electric cooling fan. If it is not moving then i would check the fan relay which is located under the right side headlamp. 9 times out of 10 this is the problem
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