Question about 1999 Cadillac DeVille
The bad news is that it is most likely a faulty actuator and this will be difficult to replace as they have to partially dismantle the dash to get at it. Go to a couple of dealers and get them to give you a quote for the work. They may not be able to give you an exact quote as they wont know exactly what the problem is until it is dismantled, so ask for an estimate. Jobs like this usually wont be expensive for parts, but there is a lot of labour involved..
Posted on Nov 22, 2017
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Posted on Jan 02, 2017
Sounds like a Blend door issue, but could be the controller switch, Test ALL modes of operation to see what works and what does not. That should narrow it down a bit. The Blend doors are flap/ doors that regulate air flow, newer vehicles are plastic - electric assemblies ...prone to failure. Any clicking or thumping noises during switching modes and on-off suggest a bad Blend door. Hope that helps...good luck
Posted on Jan 12, 2009
SOURCE: MAP sensor 1994 Cadillac Deville
The map sensor shouldn't cost more than 50 bucks or so. It is very easy to change, and can be done w/ simple tools. It mounts to the intake manifold. There is a wire connector that plugs into it. Just remove the two mounting bolts, and the connector, and it will pop right off. This is not a tough repair, so it can be done in about 10 minutes at most. This should save a trip to the repair shop!
Posted on Mar 27, 2009
Yes this models tend to do that, check the coolant mixture after repair, yes is a diy proyect but you at least will have basic mechanic abilities to perform this, make sure you mark all the hoses and cables when dismantling.
Posted on Jul 08, 2009
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
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