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i have seen this problem on Buick cars , the air coming out of the left two vents was much warmer than the right vents. turned out that the ac system was low on freon,. It does this because by the time the air gets to the left vents it has warmed. Check the low side pressure on the system. Its probably below 30 psi. Add freon until the low side pressure is about 40 psi, idling. Its an ez fix Please respond and let me know if this cures the problem.

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Q: Why do my Cadillac Deville DTS 2002 AC blow warmer air for the driver than the passenger and i did not change the passenger temp and sometimes will blow air only from down and up positions?
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