1990 Cadillac Seville STS Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Cadillac Seville STS

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1990 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.

Car Won't Start and Security Light is On

Problems with anti-theft systems using the raised-chip key can prevent the car from starting. The wires in the steering column to the ignition lock cylinder tend to break. The key and ignition lock cylinder should be replaced to correct this condition.

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