Question about 1997 Cadillac DeVille
The a/c vents are blowing cold on the passenger side and hot on the driver's side.
Could be a vacuum line but have had this problem myself. The problem is most likely the "blend" air door behind the dash. This door operates via vacuum to slightly open or close allowing heated air from the heater core to mix with a/c air in the case of the passenger operating the individula comfort control button on the passenger arm rest. When the passenger wants their side a little warmer than the driver the door opens and warm air mixes in. The fix is not good. Several thousand dollars for dealer fix. The dash must be removed(and probably drivers door). My fix was to put a shut off valve on the heater hose going into the heater core so that I can shut off coolant to the core in summer temperatures. In winter I turn it back on for heater operation. Hope it helps.
Posted on Aug 07, 2009
Look for loose vacume lines
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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