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1999 Jeep Cherokee electric fan does not come on.

Tiny
ANONYMOUS
  • MEMBER
  • 1999 JEEP CHEROKEE
  • 154,000 MILES
1999 jeep cherokee electric fan does not come on Ive replaced the fan relay, a/c relay and coolant temp. Sensor (the sensor -twice-ya never know ya could get a bad one) temp. Gauge in dash does work, when jeep is running and I unplug the coolant temp. Sensor, the fan will come on and stay on untill I plug the sensor back in ---Ive also cleaned the ground wires that I could see. Have you seen this problem? I would be glad to make a donation if you have seen this besides getting a schematic and tracing all the wires Thank you.
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Friday, March 8th, 2013 AT 9:52 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
If it comes on when you unplug the two-wire coolant temperature sensor, the system is working. You can watch the temperature on a scanner that displays live data. They typically turn the fan on at 210 degrees and off at 198 degrees. As I recall, there are a few models that don't turn on until closer to 218 degrees.
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Friday, March 8th, 2013 AT 10:00 PM

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