2002 Grande Cherokee Ltd Heater Malfunction


Old 01-20-15, 01:36 PM
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Join Date: Jan 2015
Location: Canada
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2002 Grande Cherokee Ltd Heater Malfunction

Air Conditioning working but heater not.
Preset both sides on console to 27 degrees and no heat to any vents. Is this electrical or mechanical issue...ie: Is there a computer presetting?
After motor warms up eventually cabin slowly heats. Is there a quick fix or does it have to undergo a dealership computer analysis?
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Old 01-20-15, 02:57 PM
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Join Date: Jul 2008
Location: NY
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One possibility is that there is no vacuum going to valve that opens the water flow to the heater core or the valve went bad, itself. When auto manufacturers first started to use those valves & they went bad, I would throw them in the garbage & let the water flow constantly like it used to do in the 60s. I don't know if that can be done any more.

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