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2003 Hummer H2

Question: What causes the air vents in front to give cold air and hot air at the same time

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buffalodad1, Fort Worth, TX, January 22, 2012, 14:24

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When I turn on the engine i notice that on the passenger side air vent hot air. The drivers side blows cold air. When I shut off the engine and wait an hour it sometimes works properly.

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2003 Hummer H2

Question: What causes the air vents in front to give cold air and hot air at the same time

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