Question about 1994 Jeep Cherokee

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Overheats when idaling fan not working

Where are the temp sensors at

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Temp sensor is on or next to the thermostat housing on 4&inline 6 cyl. not sure on v6 but likely same. Sensor sends signal to computer, computer sends ground to relay, relay sends power to fan motor. Test fan motor by hot wiring it to the battery. If it does not run it's bad. You can test sensor with an ohmeter. Reading at the sensor (probing both pins) should be near 7,000 ohms cold and should drop to 1,000 or less when hot.It is easier to just buy and plug in another relay if you get to the point where you need to test it. Before testing, check any fuses in distribution center to make sure that the one for the fan is intact. If you do all of above and still cannot get the fan to go on, you will need to check all wiring and connectors for breaks and good connection. Last and most unlikely is that the computer has a problem (so rare it really isn't worth mentioning)

Posted on Sep 12, 2009

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