Why is my heater not working?

Asked by Bob123456 Mar 08, 2014 at 10:05 AM about the 1998 Jeep Grand Cherokee

Question type: Maintenance & Repair

I have a 98 Jeep Grand Cherokee and the heater is not working when it is very cold. It produces heat when it is not extremely cold, but otherwise does not get hot.

3 Answers
165

Bob-Christine answered 11 years ago

Did you try flushing the heater core out yet? Could be partly plugged. It can plug and your temp gauge won't show any difference.

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325

dropkick5nineliter answered 11 years ago

I had to replace the heater core on my 98 5.9 limited a few years back and no issues since. We get some decent cold spells in Colorado.

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165

Bob-Christine answered 11 years ago

I am trying to compare my 98 with the inline 6cyl 4.0L to yours. So I don't know if the control valve is inside under the dash like mine or not. The reason I suggested about flushing is it not only would check the heater core but also the valve and the hoses. Which I have had one where the inside wall separated and collapse shutting down the flow. Just a thought.

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