Question about 1999 Cadillac DeVille
When I turn on the A/C I have hot on drivers side and cold on the passenger side. 1999 cadillac deville
I had the same problem just now and figured out what the problem was. I don't have a climate control button on my dash but on the passenger door, where you have the set button, try and click your number 1 setting. The a/c heater should go off. Then manually turn your a/c back on. It should be blowing cold air on both sides of the car. Somebody must of set it before I bought the car and the settings are preprogrammed in. If the set 1 doesn't do it for you, then try the set 2 button. Theses buttons get accidentally hit when either getting in and out of your car or when you use the seat button or window button. Hope this helps......
Posted on Dec 26, 2008
Have a young friend of the family who has adopted me as an uncle (he
keeps his Dad's Caddy and his real Uncle's Caddy running smoothly). He
recently fixed this problem on my car, same as he'd seen on his Dad's
car - there's a rod assembly that opens and closes the vents in the car
for the automatic climate control. It's supposed to open all vents to
the AC feed when in AC mode. BUT, if it slips loose, the default
status is to feed heat through (you can open a window in the summer,
but you don't want AC blowing in your face and on your windshield in
the winter). In my case, the driver's side was working right, pumping
cold air, but the passenger side was actually dumping hot air into the
car. Don't know exactly where, but my friend told me he just had to
drop the glove box etc. on the passenger side to get to the rod and
slipped it back into place. I'm not agile enough, but if you are, you
can probably crawl around under there and figure it out - or get a
friendly mechanically inclined young friend to do it for you. Probably
in the mechanic's manual for the Caddy (I don't have one).
Think this will fix it for you - did for me.
Posted on Jul 29, 2008
Your frion is low or tempture controll unit can be bad
Posted on Jul 26, 2008
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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
The blend door for the passenger side is not connected right or functioning correctly. Try seeing if the dial on the armrest on the passenger side is not rotated one way or the other too much.
Posted on Sep 20, 2010
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