Question about 2000 Jeep Wrangler

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2000 Jeep wrangler is blowing lukewarm heat, is this a bad heater core? or could the heater core be plugged? if plugged how do I unplug it? and if bad how do I replace it?

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  • CarySchroeder May 11, 2010

    Could be a plugged heater core, a plugged line to the heater core, the valve to allow water flow through the heater core if it is a problem in the water side of the heater. If it is on the air side, the mixer valve that controls the amount of hot air that is allowed in may not be functioning correctly.

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  • Jeep Master
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If you have a heater control valve on the hoses going into the heater, make sure it's working. Heater core can be plugged, most times they can be cleared by removing the hoses to it (not at the firewall...it's too easy to break the core extensions) drain it and fill it up with white vinegar.(keep the hoses higher than the core) Leave it sit about a half hour and run a garden hose through it. Last but not uncommon is that a vacuum motor that operates a door inside the heater plenum can be bad or the door itself can jam. To remove the heater to service either the core or any of the doors etc is generally a large job that you would need to get a manual for. (most of dash needs to come apart) Hope you find the problem before it comes to that!
Good luck

Posted on Oct 06, 2009

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