Question about 1999 Jeep Grand Cherokee
99 jeep cherokee lerado, stuck in traffic it overheats, the fan deesn't ever turn on, electric cooling fan controlled by the pcm. 4.0L 6 cylinder. The top radiator hose gets hot so i feel that the flow is good in the radiator.
About 1500 miles ago the dealer replaced the TPS(Throttle Position Sensor) from diognostis code check engine light. 500 miles ago dealer replaced the speed sensor on the crank case. Now this sounds like another relay, sensor switch etc. problem.
I know i have to get the fan thing figured out so what do you think on that, but do you think the PCM(Power Control Module could be the result of all these problems happening since the last oil change. Doesn't seam to be too coincidental.
Does both the hoses get hot bottom and top? this will tell you if theres flow through the radiator. If you have a voltage tester test the wires on the fan connecter check there is current going to the fan if so replace the fan its a common problem as previously stated.
if there is no power to the fan when the vehicle should be turning it on i.e. its hot enough check the fan relay under the hood.
Posted on Nov 27, 2008
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