1992 Cherokee Laredo AUX fan only turns on with a/c? - JeepForum.com
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post #1 of 3 Old 05-16-2013, 02:28 PM Thread Starter
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2000 TJ Wrangler 
Join Date: Jan 2009
Location: Colorado Springs
Posts: 578
1992 Cherokee Laredo AUX fan only turns on with a/c?

Hi all,

Been having some warmer weather here in Colorado and was driving around and noticed the jeep was running hot. Between 210 & 230. Only was getting hot when sitting at a light. Long story short the Aux cooling fan only comes on with the a/c on. It won't come on when the jeep is getting hot. If im not mistaken it should. So what controls the on/off of the aux fan with excessive temp?

1992 Jeep Cherokee Laredo
4.0L Inline 6

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post #2 of 3 Old 05-16-2013, 03:02 PM
Paradise XJ
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1988 MJ Comanche 
Join Date: Jan 2007
Location: Paradise, CA
Posts: 2,425
On your 92 the temp sensor in the thermostat housing tells the computer to turn the fan on.

If you unplug it, the fan should come on...if that happens, replace the sensor.

1990 XJ Laredo - White & Chrome
1988 MJ Pioneer - Metallic Green and Black
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post #3 of 3 Old 05-16-2013, 07:47 PM
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1994 XJ Cherokee 
Join Date: Apr 2010
Location: College Station
Posts: 143
and when you unplug the ect the check engine light will come on so after you figure it out unhook the battery for 30 min to reset KAM(keep alive memory) which will reset fuel trims and idle so when you start it up have the A/C off so it relearns the idle with out the load or else when the A/C kicks on it might die or idle too high.
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