Take the glove box off. Behind the glove box you will see a cable that goes to the Diverter Flap. Reach over that cable till you hit the fire wall. Your hand should be directly over the Vacuum motor that controls that flap that send it dash or defroster. If that heataer core has been replaced I bet they frogot to hook the line to it. Sould be able to feel the nipple thathe line goes on. Line should loop over the box in that area.
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Grim-Reaper
70 Pontiac LeMans Sport Convertible, worlds longest resto in progress
Looking for 71-72 2wd Blazer or Jimmy Project
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