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How come Heat comes out vents when heater turned on instead of floor 1990 sub2500?
Sonnyhegarty
You have a vaccum leak that keeps the heater door from opening. Some of the vehicles have a vaccum control module under the dash that sometimes goes bad. This is what happened to my Dodge Ram. Check with a dealer in their parts department and they can tell you if this could be the problem. They should have a diagram showing where its at. Good luck.
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