Question about 2001 Jeep Grand Cherokee

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Fan turns on intermittently

My 1999 Grand Cherokee would overheat in a matter of 20 mins or so if i am doing normal street driving. If i am on the freeway with no traffic, my truck would be fine and not overheat because it would get natural air to the radiator, so i dont think its the radiator.

I have replaced my thermostat, fan motor, water pump, and my coolant temperature sensor, because i took my electric fan out and tested it with negative and positive current and it didnt come on. After replacing the above mention, it tested the electric fan, and it works fine. After installing it back in the truck, the fan comes on at times, but when the truck starts to reach operating temperature and the fan should come on, i open the hood and the fan is not on.

I am about to drain the entire cooling system, hoping that i just dont see the fan come on when it actually does, but please give me advice on what to do if this does not correct the issue. The reason i think the fan is coming on, but not staying on as long as it should is because prior to replacing all i did, the truck would over heat in about 20mins all the time on street driving, only except if i was on the highway with no traffic, but now the only way it over heats is if i am sitting in traffic where i am basically still for extended amount of times.

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  • mandell_anth Dec 18, 2008

    This fixed my issue. I end up having to replace the fan motor and the relay sensor that was behind the front bumper. Taking the left headlight out didnt work, because it sat down under a piece of metal and behind the bumper. Once i got the bumper off, it was pretty easy to replace the sensor.

  • stevev357 Apr 19, 2009

    I have 1999 jgc and the cooling fan is not turning on to cool the engine. I replace fan switch still not working. I applied 12 volts to the fan motor fan did turn on so i believe the fan motor is good!? What else should i be looking for????? please help! Thanks in advance!

  • Rabindra Robinson May 11, 2010

    how much of antifreeze does your sys hold when you empty the whole thing what is your engine size and does the readiator grill look greenish please respond



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Facia just means the bumper covering, and the relay is located underneath the right head lamp assembly easiest way to acess this is to remove the head alm assembly, i mean not just the bulb but the whole assembly.But before doing this make sure that there is no air trapped inside the cooling sys which prevents water from circulating and thus causing the over heating!!

Posted on Nov 19, 2008

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Thank you for the postings to my problems. Robynnumber1, I have a 6 cylinder 4.0L engine in my Grand Cherokee. Jesse777, where is the relay located and the bumper fascia, which i will try first.

Posted on Nov 17, 2008

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These have been plagued with faulty cooling fan relays. The relays are a little different than common relays in that they are pulse-width modulated. These cost 3-4 times as much as normal relays.

The relay is hard to get to. The factory manual actually recommends removing the bumper fascia. This can be accomplished much more simply by removing the passengers (right) headlight. I can provide more detail if you wish to repair the problem yourself.

Posted on Nov 17, 2008

  • jesse777 Nov 17, 2008

    The bumper fascia is simply the bumper cover. This is time consuming, that is why I offered the 'tech tip' which is a time saving short cut. This is another 'tech tip' the dealer often uses, this involves cutting a hole to gain access to the relay (I don't recommend this).

    What you need to do is remove the headlight to get to the relay--

    Here is link showing the relay-

    Once the headlight is removed you can remove anything else that allows easier access for you.

    Don't allow the engine to overheat again, engine failure will surely follow (sooner or later).

    Update me on how this goes OR if you have additional questions.

  • jesse777 Nov 20, 2008


    Is your fan still not working? Please stick with us until we solve your problem...


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