Question about 2000 Jeep Grand Cherokee

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My jeep has dtc 1491 it has to do w my coolin fan circut .replaced relay and juped fan it works but wont cut on when plugged in.any ideas

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Richard Scordino

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Aside from checking the actual wiring for proper connections and shorting, the only thing you have not changed is the temp sensor. Sensor sends a signal to the computer which sends a ground to the relay which then completes the circuit to the fan. The fan should not run full time but only when needed. Sometimes covering the front of the grille with cardboard to force it to overheat is faster than standing there waiting for it to get hot enough to come on. If it begins to overheat and the fan still has not come on, change the temp sender and check the wiring and connectors with a meter. The computer could also be bad but that is extremely rare.

Posted on Jul 01, 2010

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1 Answer

My coolin fan wont come on wat should I do


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1 Answer

Code 1491


1491-radiator fan relay control circut
1492-ambient/battery temp sensor volts to high
check and make sure your radiator fan is coming on
samboiv















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