Question about 1999 Jeep Grand Cherokee
If your electric fan(s) is not coming on when the engine is hot, first check the fuse, usually in the fusebox under the hood. Then, with the engine hot and running, pull out the fan relay (usually in the same box as the fuse). If it's working, it should click when removed and again when replaced in its socket. If it doesn't, suspect the relay or sensor has failed. See my note here on how to troubleshoot the relay socket: http://www.fixya.com/cars/r6022358-relay_check. If your gage runs off the same sensor and works, it's probably fine. If you're good with electronics, you can also test the sensor. If these are all good, either the wire to the fan is bad or the fan itself is bad. You can test the wire for voltage with a test light hooked to the fan connector.
Please let me know if you have any questions.
Posted on Nov 13, 2010
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Posted on Jan 02, 2017
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