2003 Cadillac Seville STS Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2003 Cadillac Seville STS

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2003 Cadillac Seville STS Problems

Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator

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.

Trunk Lid Won't Close Due to Trunk Pull Down Switch Failure

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.

Coolant Leaks From Water Pump and Radiator

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.

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2003 Cadillac Seville STS Questions

Heater blows cold, actuators working and cabin filter clear. What next? (1 answer)

I have a 2003 Cadillac STS. A/C works fine however, heat blows cold. Using a simple temperature test I have verified coolant appears to be flowing through heater core, not 100% certain but trouble isn’t leading me that way. I have checked all the actuators I can find, one on left and right side o...

i need a windshield replacement and alternator replacement how much would that cost? (2 answers)

How many camshaft position sensors are there on a 03 cadillac seville sls? (1 answer)

Im getting camshaft codes and misfire codes I already replaced one sensor how can I find out what else is causing the misfire

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2003 Cadillac Seville STS Reviews

Rated
based on 3 customer 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...
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.

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