The air on your 1990 GMC Suburban wont switch fully from ac to defrost still have air coming out of the ac ventswhat do you do also you have hot air coming out of ac vents with ac on and set to cool?

In: Heating AC and Engine Cooling, GMC Suburban [Edit categories]

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is it because of a lack of vacuum pressure?

First answer by Jack omelak. Last edit by Jack omelak. Contributor trust: 48 [recommend contributor]. Question popularity: 42 [recommend question]

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Answers.com > Wiki Answers > Categories > Cars and Vehicles > Auto Parts and Repairs > Heating AC and Engine Cooling > The air on your 1990 GMC Suburban wont switch fully from ac to defrost still have air coming out of the ac ventswhat do you do also you have hot air coming out of ac vents with ac on and set to cool?

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