Question about 2000 Chevrolet Silverado
GM had a bulletin regarding this several years ago. There can be an air leak from the cowl into the heater box. You need to remove the trim on the cowl by the wipers. Under that you find a oval shaped metal plate that is sealed with caulk on the pass side. You need to scrape the caulk off and with a chisel break the plate loose and remove it. Inside of that is a passageway that supplies air to the heater. The seam inside that passage is leaking and allowing cold air to come in behind the glovebox. Seal the seam up with caulk, or sealant. I have used the sticky alum foil tape. It's a little easier to work with. Doesn't have to be pretty. Replace the cover and hold it down with a couple sheet metal screws and recaulk around the edge.
Posted on Jan 14, 2009
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