To stop the complaints that people could actually hear the fan run, it is controlled now by an electronic variable-speed relay. As with any other computers, that module is much less reliable than simple circuits with standard relays. There are other possible causes of a dead fan but the relay will be responsible for the problem about 95 percent of the time.
I'm not sure where that relay lives on your Jeep, but on minivans it is about half way down on the drivers side of the sheet metal next to the radiator. There are four wires in the connector. Be sure it is mounted solidly with both bolts, otherwise it will overheat very quickly and short.
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Thursday, May 12th, 2011 AT 4:10 AM