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sounds like a vaccum line is off. Do you have an aftermarket stereo? I could also be the switch, but I would bet on a vaccum line, search for a diagram then go from there.

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โˆ™ 2009-08-21 00:48:59
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Q: How can you fix your heater vents on your 1996 GMC Jimmy; it only blows through the defroster regardless of which vent you select?
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