1979 Heater Box
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Cross-Country
Joined: Sep 2003
Posts: 68
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From: CENTRAL PA
1979 Heater Box
Hi, I have a 1979 F-250 pickup. When I run the defrost I don't get much air up to the windsheild. After checking out the problem, I discovered that there is a 3/4 inch gap between the air defrost duct and the heater box. I assume there should be a seal in there, but I don't see one listed in my shop manuals. I also don't see how the defrost duct attaches to the heater box. Thanks Gary
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Joined: Sep 2003
Posts: 1,192
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From: lino lakes, mn
it has a foam spacer about 1 1/2 to 2 inches thick that is cut to the shape of the top of the heater box and glue to either the duct or heater box the duct work hangs from 4 screws inside the duct at the dash
