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heater vent no work?
hey guys i bought a 1988 gmc sierra 1500 reg cab long box over a year ago now ever since i bought it .. whenever i put the heat on it only comes out of the top vent not the middle or sides now i found this kinda retarted lol and i was wondering if anyone had this problem before and if theres any kind things i should be looking for to fix this problem....
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