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the dual climate control valve is bad This has happened to me in the past when the Freon was getting low. Shorty after this I found out I was completely out of Freon. IGNORE THE SECOND ANSWER. THE DUAL CLIMATE CONTROL VALVE IS BAD OR YOU SIMPLY HAVE THE DRIVERS SIDE ON HEAT.

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โˆ™ 2006-07-14 09:00:46
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Q: Why would a 1999 Pontiac Grand Prix GTP blow heat from the driver's side vents and cool air from the passenger side when the air conditioning is on?
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