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Old 06-08-2014, 06:28 PM
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Cooling Fan Not Functioning

Hello all. Just purchased a 2000 GC & have a question. He was in a slight fender bender where the front edge of the right front door and the back portion of the right front fender got very slight wrinkle. He tells me at the same time the cooling fan quit working. Not sure if it's a cooincidence or not. He put a new fan & a new sensor (the one located at the right front corner of the bumper), but it still won't come on.

What's the next step to get the fan to work?

Also, how common is putting a fan/fan clutch in place of the electric unit? I see that the water pump has a threaded hub.
thanks,
Mike Sal
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Old 06-08-2014, 06:49 PM
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Re: Cooling Fan Not Functioning

Welcome to the garage.
Does the engine overheat? Also when switching AC on nothing happens?
Was fuse 10 (40A) in the power distribution center under the hood checked?
Some jeeps have the extra fan on the waterpump shaft. I believe it can simply be installed when extra cooling is needed, but i believe it will not substitute the electrical fan. The mechanical fan will rotate too slow in idle to cool sufficiently.
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Old 06-08-2014, 08:55 PM
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Re: Cooling Fan Not Functioning

Thanks for the reply. We've only driven it about 4 miles (home from the seller) in 70 degree (F) weather. It did not overheat while setting in the drive way after we arrived, but the seller did tell me that it would warm up more than it should. I forgot to mention it's a 4.0L / automatic. It's got just over 200,000 miles on it, but still runs very smooth & quiet.

Is there a temp sensor on the motor that talks to the sensor in the front corner?
Mike Sal
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Old 06-08-2014, 09:15 PM
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Re: Cooling Fan Not Functioning

Quote:
Originally Posted by Mike Sal View Post
Thanks for the reply. We've only driven it about 4 miles (home from the seller) in 70 degree (F) weather. It did not overheat while setting in the drive way after we arrived, but the seller did tell me that it would warm up more than it should. I forgot to mention it's a 4.0L / automatic. It's got just over 200,000 miles on it, but still runs very smooth & quiet.

Is there a temp sensor on the motor that talks to the sensor in the front corner?
Mike Sal
Yes and no. There is a single temperature sensor, but it doesn´t talk.
The temperature sensor sends a resistance value, depending on the coolant temperature, to the PCM (Powertrain Control Module). The powertrain control module then sends a signal to the fan relay under the headlight.
When the coolant temperature indicator works ok, then the sensor is ok as well.
Did you check the fuse in the PDC under the hood?
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