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post #1 of (permalink) Old 10-18-2001, 04:37 PM Thread Starter
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Heater no blow hot air

I've got air, I've got temp, now if I could just get the two in the same place at the same time. Before it gets really cold out, I'd like to figure out why the heater is just blowing lukewarm air. Anyone know?



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post #2 of (permalink) Old 10-18-2001, 05:44 PM
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Re: Heater no blow hot air

Either the blender door is sticking, or the heater core is plugged. Follow the cable from the temp control and see if you can operate the door manually.
If you're sure that damper is opening all the way, the heater core is probably plugged up. If that's the case, you'll need to flush the cooling system real good and probably replace the core.

-Derek Schwab
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'83 CJ-7
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post #3 of (permalink) Old 10-18-2001, 06:32 PM
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Re: Heater no blow hot air

If the diverter doors are operating normally, pull the plenum assy. Check that the heater core is not plugged externally by pine needles and leaves and also check the flow of the heater core.

If you get it to work, share your secret with us!

1976 CJ7 304/TH400/QT/D30/AMC20
Front D44 in process.
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post #4 of (permalink) Old 10-19-2001, 12:53 AM
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Re: Heater no blow hot air

My bet would be that the foam on the end of the blend door came off. Without it, the door won't keep air from going around the heater core. I had to glue mine back on.

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