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 2003 Cadillac Seville STS
2003 Cadillac Seville STS
2003 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 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.
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.
2003 Cadillac Seville STS Questions and Answers
How to replace a burned out lamp in the fog lights? How to replace a burned out lamp in the tail lights?
Did GM ever upgrade the head gaskets in the 4.6L northstar engine in later years? If so which years? 2003 and/or 2004?
battery not charging
car is driving fine but when sitting still and running it sounds like it wants to cut off and has a missing sound what could the cause of this be? Would someone please tell me where the fuel filter...
i need to know plz help me
2003 Cadillac Seville STS Reviews
I own a 1998 and 2003 Cadillac STS, both have had oil leaks and driver's seat heater failure at approximately 85,000 miles. The resealing of the crankcase and oil pan requires removing the transmission. Paid $1,500 each to reseal the engines. The seat heater requires pulling the cover and cushion back and splicing the broken wire feeding into the heating pad. I paid $245 to have a repair shop do this on my 1998 STS. I did it myself on the 2003. I use a single strand, out of a light gauge electrical wire, to make the splice. Then wrap the splice with electrical tape.
i love this car very fast, but ever seville i see including mine have a tail light out, on mine its not the bulb or the fuse ???
I just bought a 2003 STS and this car is the best car that I have ever owned.