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1992 Jeep Wrangler with no heat in cabin

I have replaced all of the hoses, the thermostat, flushed the entire system, and I know the heater core is not plugged. I also put on a new radiator cap. The vehicle isn't overheating, it just won't blow hot air inside the cabin. The lever to change from hot to cold air seems to be working. I can see the lever move, and it sounds like a flap/door moving. I am stuck. Help me please.....

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It dosen't happen often, but the air intake side of the core can become obstructed with leaves etc. If that is the case, the only way I know of to fix it is to remove the core & clean it. You did check the heater control valve to make sure it is allowing proper coolant flow through the core, right? Did you run it after refilling the system with the cap off and the heater on high to purge any air in there?

Posted on Feb 05, 2009


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