One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.
Resources for the Repair and Maintenance of your 1999 Cadillac Seville STS
1999 Cadillac Seville STS
1999 Cadillac Seville STS Problems
The anti-lock brake system (ABS) control module may fail causing the ABS light to illuminate. Failed modules should be replaced to restore ABS operation.
The trunk pull down switch may fail causing the trunk lid not to close completely. Our technicians tell us that the failed switch can be replaced without changing the complete pull down motor assembly.
The water pump and/or the plastic side tanks on the radiator may leak causing a loss of coolant. The engine may overheat due to coolant loss. Continued coolant loss after external leaks have been repaired could indicate a blown head gasket.
The parking brake may not release automatically due to a failed vacuum switch or actuator. Our technicians tell us that if vacuum is supplied to the actuator when the transmission is in gear, the vacuum switch is functioning and replacing the actuator should correct this concern.
1999 Cadillac Seville STS Questions and Answers
I just bought a 1999 Cadillac Seville STS from a private owner Thursday afternoon. I understand that because I paid for it in cash I have no legal grounds to bring up something against the seller. ...
why does my cadillac only turn on when service engine soon light is on..?
Let me try this again. I usually have problems explaining things. The dashboard lights such as the instrument panal and the guages usually come on when the vehicle is cranked and is running. These ...
I changed the spark plugs on this vehicle after buying it. I ran a little riugh before but runs smoothly now. After changing the plugs, i started having problems with the vehicle cranking. The inst...
1999 Cadillac Seville STS Reviews
Purchased in 1999, original owner, I only drive it occasionally and have around 71k miles on it now. Only 1 major issue with the vehicle - a nagging vibration at 65mph caused by either axle or something in the suspension up front. Original tires, and replacement tires as well as rims have been high speed road force balanced twice but vibration continues. Replacing the axle will be next, something I can do in the driveway. My Northstar burns oil, always has, like a big block truck motor it uses about a quart for every 2500 miles. Holding my breath for the notorious head gasket failure. If that happens, I'm off to buy another brand this time around.
my car has 251,000 miles and is still going strong--put used struts & windshield in it in the last 3 years--5000 rpm at least once a week for a couple minutes to keep that northstar from useing oil works--use a quart every 3k---don't drive a northstar like a grandma and it will treat you right!---love this car---
I own a 1999 Seville STS with 193k miles. The only issues on the interior are:
Front passenger door lock switch will only un-lock, not lock.
Front passenger window regulator failed, needs replaced.
Brake light circuit open, switch needs alignment.
Only mechanical problems are:
Right rear air ride strut has air leak, causes compressor to run often. Does not affect driving performance but will cause compressor failure if not repaired. Going to convert to coils.
Front end alignment is good, but steering wheel is not aligned to the center postion. Does not affect driving performance.
Car is still going strong. not throwing any major codes. Compresssion is stil good, head gaskets are good. Brake rotors have a minor warp but nothing too serious.
My 99 has 175,000. Ive had the head gaskets done, replaced the radiator, and a few small items. Only the drivers side window works. The other 3 had the regulators break within 2 days of each other. Need to replace ABS sensor in right front. Upgraded the speakers from Bose to Sony. HUGE DIFFERENCE. Has 20's on her. Really does compromise the ride but you get used to it and they look great. I love this car but Im going to have to sink even more money into it to make it right. Should not have to do that on a car over 50K new. Wise up GM
after replacing an alternator the remote has stopped working; the car is unable to lock up and the gas tank is unable to open