Question about 1999 Jeep Grand Cherokee

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Overheating problem on 99 Jeep Grand Cheroke Loreado

I replaced Radiator, Thermostat, Coolant Tempreture Sensor,Belt, cooling system sensor but car continues to overheat in traffic, I also had to replace the cooling fan because it came apart, and i,ve notice when you shut the motor off the fan don,t continue to run. i dont know what else to do plesse help

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  • cupidtruckin May 21, 2009

    every thing is okay there I checked the fuses swaped relay the fan is working fine,the only thing with the fan is when I shut the motor off the it dont continue to run

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Hi,

If the electric cooling fan is inoperative, check the 15A fuse in the junction block and the 40A fuse in the Power Distribution Center (PDC) with a 12 volt test lamp or DVOM. Refer to the inside of the PDC cover for the exact location of the fuse.

OR

Is the electric fan coming on when the AC is turned on? That should supply EXTRA air flow through the condenser & radiator (to keep the system cool) during AC operation.

If the fan is not coming on, check the control relay. You MAY be able to swap it with another one of the same type. These relay should be under the hood
.

Thank You

Posted on May 21, 2009

  • e-Guru
    e-Guru May 21, 2009

    it sounds like the fan relay in the constant control relay module (CCRM) is stuck. There are two relays, one for the low speed and one for the high speed fan. I would tell you to break open the CCRM and put a new relay in, but if you don't know anything about cars, you should just replace the CCRM. The CCRM is located under the box that your air filter goes into. It is black, about 4" by 3", and has a lot of wires going to it.



    This car will only run the fan when the key is on. The PCM actually grounds a relay in the CCRM to turn the fan on. If the PCM isn't active, the fan can't be active. Unless, either the ground wire from the PCM is touching a ground or the relay is fused together.



    Thank You

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