Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS AC problem in Past Cadillac Vehicle Discussion; 99 seville STS passenger side vents blowing hot air even if AC switch is turned off on passenger side...
You'll likely get better and more timely responses by posting in the Seville forum. This area is for the 2005 & up RWD & AWD STS which is quite different. In our cars, low freon affects the passenger cooling first. I can't say if the same is true on yours. I had a '98 but never had that issue.
Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT 4WD
MD Eastern Shore
Re: 99 STS AC problem
Please do not start double threads on the same problem. Your other thread, posted in another incorrect forum, was enough to get the problem on the path to diagnosis. Let the thread work for you - it might take a bit of time - but the info will all be in the same place.