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1990 Cadillac DeVille Problems

Find the most common issues based on 1990 Cadillac DeVille owner complaints.
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Most Common 1990 Cadillac DeVille Problems

One or more of the power window regulators (one in each door) may fail causing the window to fall into the door and not roll up.
One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored...
The engine may develop oil leaks from the lower crankcase portion of the engine block. Our technicians tell us that the engine must be removed from the vehicle to properly repair this oil leak.
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2 Known 1990 Cadillac DeVille Brakes 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 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...

2 Known 1990 Cadillac DeVille Drive Train Problems

The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be r...
You may be able to prevent transmission problems by servicing the transmission and inspecting the fluid every 30,000 miles. If the fluid is dark or burned then the transmission system should be com...

2 Known 1990 Cadillac DeVille Electrical & Lights Problems

Problems with the 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 the key and igni...
It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pum...

9 Known 1990 Cadillac DeVille Engine Problems

The engine may develop oil leaks from the lower crankcase portion of the engine block. Our technicians tell us that the engine must be removed from the vehicle to properly repair this oil leak.
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 r...
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.

3 Known 1990 Cadillac DeVille Exhaust & Emissions Problems

The powertrain control module (PCM) can fail causing stalling, and various engine and transmission drivability concerns.
The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
An updated PROM (Programmable Read Only Memory) chip may be available for the powertrain control module (PCM). Check with your dealer.

2 Known 1990 Cadillac DeVille Heating & Air Conditioning Problems

One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored...
The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.

1 Known 1990 Cadillac DeVille Maintenance Problem

Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.

2 Known 1990 Cadillac DeVille Miscellaneous Problems

One or more of the power window regulators (one in each door) may fail causing the window to fall into the door and not roll up.
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 assem...

2 Known 1990 Cadillac DeVille Suspension & Steering Problems

The electronic level ride system may not work properly; this may result in the rear of the vehicle riding too high or too low. Our technicians tell us that a height sensor or exhaust valve failur...
The high-pressure power steering lines are known to leak.

25
Known 1990 Cadillac DeVille Problems & Complaints

Problems with the 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 the key and igni...
The engine may develop oil leaks from the lower crankcase portion of the engine block. Our technicians tell us that the engine must be removed from the vehicle to properly repair this oil leak.
One or more of the power window regulators (one in each door) may fail causing the window to fall into the door and not roll up.
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 assem...
One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored...
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 air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.
The electronic level ride system may not work properly; this may result in the rear of the vehicle riding too high or too low. Our technicians tell us that a height sensor or exhaust valve failur...
It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pum...
The high-pressure power steering lines are known to leak.
The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be r...
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.
The alternator may fail causing the battery to go dead, or an abnormal noise may develop. The dash warning light may or may not illuminate. A failed alternator will require replacement.
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
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