Question about Jeep Cherokee

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The Auxillary cooling fan will not operate. I changed the fan and relay but it still will not operate. Engine temp comes up over 200 degree's and should pull fan on like it used to do.

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Normal operating temp is between 200 and 210. If it gets hotter than that there is a problem. The system works as follows:
Temp sending unit sends signal to the computer which in turn completes the ground circuit to the relay which then turns on the fan. All connectors and wiring need to be clean and intact for it to operate properly.
To check initially you can put a piece of cardboard over the grille while it is idling and force it into a near overheat. If the fan comes on, it is working, if not, you need to trace the problem down.

Posted on Sep 03, 2010

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The car is overheating and the fans are not coming on. I changed the coolant temperature sensor still not working. I also jumped the fan they were working relay everything is good. No leaks.


What make , model an year vehicle ? The PCM / ECM engine computer controls that relay . The best way to diagnose this is to hook up a scan tool an see if the PCM / ECM can control ( turn on ) the relay ! I'm going to ask a silly question , what are you going by to determine the vehicle is over heating ? The Temperature gauge . Temp. gauges do go bad . Hooking up a professional grade scan tool that can read engine sensor data PID'S is the way to see what the PCM/ECM is seeing as far as engine temp. Most vehicles the cooling fans don't come on till 200 to 220 degrees ! You could buy a temp gun at harbor freight an see what the temp is at the upper rad. hose .

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Well, yes and no.
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Did you check for voltage at the relay ?
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The range should be in the temp range of your thermostat within in a few degrees, you probably have a 190 degree thermostat. As the outside (ambient) temp rises it's normal for the engine to run a little hotter 200 degrees is safe with coolant, water boils at 212. Your fans should cycle, so it sounds like your temp sensor is faulty. if you haven't flushed your radiator and changed your thermostat lately, now would be a good time to do so. Hope this helps,

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P2181 Cooling system performance

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