Question about 1999 Jeep Grand Cherokee

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My 1999 Jeep GCL overheated, my a/c works when on high only and will go in and out if on lower degree. Is this the relay fan causing this? How much do the relay fans cost? thanks a bunch!

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Are u talking about engine overheating? ac needs blower motor reistat if engine is over heating see if fan is working above 218 degrees if not replace cooling fan relay its under passenger side head light .

Posted on Jun 05, 2009

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I have a 99 jeep grand cherokee 4.7 that is overheating whenin traffic or at a stoplight or drivethru. i have a check engine code p01491 . i have replaced the fan relay.i hhave jumped the fan it works ....


The relay gets power on the gray wire from a 40amp fuse. The relay is grounded and gets a power signal from the PCM on the dark blue and pink wire. The PCM signals the relay if the engine temp reaches 220 degrees or the ac is turned on and it works.
You would need to have a scanner or the means to read engine temp to find out if the computer is signaling the relay on when the coolant temp reaches 220 - 225 degrees.

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A mechanic would use a scanner to check the engine temp sensor.
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Since you said relay I am assuming your Jeep has an electric radiator fan.

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Is the fan coming on when it overheats? If it is than its not the fan relay. It is likely the thermostat. If the fan is not coming on than it is likely the relay. They fail in two ways. One they do not turn on the fan and two they keep the fan on all the time. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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Hello , i had replace the radiator fan relay and the fan wont kick on. i had jump the the fan with the battery to see if the fan motor is still working ,which it still is. is there anything else i would...


Most fans are designed to turn on only when the engine temp reaches a certain degrees and even then it will only turn on till it brings the engine temp down then it will turn off and it will cycle in this manner.I ask you why did you change out the fan relay was your jeep overheating?

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