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1990 Cadillac DeVille Problems

RepairPal has identified the most common problems with the 1990 Cadillac DeVille based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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25
Known Problems

The powertrain control module (PCM) can fail causing stalling, and various engine and transmission drivability concerns.

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 oil pressure switch and timing cover gasket may develop an engine oil leak.

This powertrain control module (PCM) may develop a fault with its electrical ground location at the front of the engine block near the starter motor.

The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.

The spark plugs should be replaced every 30,000 miles and the spark plug boots should be checked for hot spots and cracks.

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.

An updated PROM (Programmable Read Only Memory) chip may be available for the powertrain control module (PCM). Check with your dealer.

Our technicians highly recommend that the fuel filter be replaced every 30,000 miles.