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1990 Mercedes-Benz 420SEL Problems

 

Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor

Verified for the Mercedes-Benz 420SEL

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

7 Reports
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"No start" Caused by Failed Fuel Pump/Relay

Verified for the Mercedes-Benz 420SEL

The fuel pump and/or fuel pump relay can fail, causing the car to crank over but not start. Proper diagnoses will be necessary to confirm if the pump or relay is at fault.

3 Reports
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Climate Control System Problems Due to Wear in Climate Control Buttons Contacts

Verified for the Mercedes-Benz 420SEL

The climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly required to correct this problem.

2 Reports
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AC Not Cold Due to Leaking Hose

Verified for the Mercedes-Benz 420SEL

A refrigerant leak may develop from one or more of the AC hoses. Proper leak detection procedures should be followed if refrigerant loss in encountered. Replacement of any leaking hoses will we required to restore proper AC operation.

2 Reports
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Rough Running Engine Due to Misfire

Verified for the Mercedes-Benz 420SEL

A rough running motor or lack of power can be caused by a failed distributor cap or rotor, ignition wires (or their resistors), or valve cover gasket leaks. If the valve cover gasket leaks, oil can pool where the ignition wire resistor connects to the spark plug. The resistor can fail and the spark plug may not fire because of a short circuit through the oil.

2 Reports
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Incorrect Idle Speed Due to Stuck Idle Air Compensator

Verified for the Mercedes-Benz 420SEL

It is not uncommon for the idle air compensator to get stuck in one position, resulting in the engine idle speed (rpm) being too high or too low. Replacement of the failed compensator may be necessary to correct this concern.

5 Reports
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Catalytic Converter Failure Due to Engine Burning Oil

Verified for the Mercedes-Benz 420SEL

Valve stem seals may wear and cause the engine to burn oil. this can contaminate the catalytic converter and cause it to fail.

3 Reports
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Transmission Oil Seals May Leak on High Mileage Vehicles

Verified for the Mercedes-Benz 420SEL

High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.

 

2 Reports
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Fluid Leak From Front of Vehicle

Verified for the Mercedes-Benz 420SEL

A worn steering dampening shock can cause a fluid leak at the front of the vehicle. If a leak is noted from the dampening shock, our technicians tell us that it should be replaced.

2 Reports
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Instrument Cluster, Turn Signal/Wiper Combination Switch May Fail

Verified for the Mercedes-Benz 420SEL

The instrument cluster, along with the turn signal and wiper combination switch, can fail.

2 Reports
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ABS Modulator Failure Due to Dirty Brake Fluid

Verified for the Mercedes-Benz 420SEL

As brake fluid becomes dirty over time, it can cause a failure of the anti-lock brake system (ABS) modulator assembly. Our technicians recommend a complete brake system flush every two years to help prevent this issue.

2 Reports
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Excess Free Play in Steering and/or Alignment Issue

Verified for the Mercedes-Benz 420SEL

The tie rod ends, idler arm, and/or drag link components of the steering linkage may wear prematurely. Please keep in mind the wheel alignment should be checked and adjusted when any of these items are replaced.

2 Reports
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Improper Temperature Output From HVAC

Verified for the Mercedes-Benz 420SEL

One or more blend door vacuum actuators may fail resulting in the incorrect output temperature from the HVAC system. Failed actuators will require replacement to restore proper HVAC operation.

2 Reports
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Squeaking/Worn Brake Pads May Require Rotor Replacement Also

Verified for the Mercedes-Benz 420SEL

The brakes may begin to squeak at about the 50 percent wear point. This is due to the size and material used for the brake pads and rotors.  The brake rotor surfaces become uneven, causing a lip to form at the outer edge. This will generally require replacement of the rotors when the pads are worn (pad life varies depending on driving style and terrain).

2 Reports
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The Differential May Develop Leaks From the Seals or Cover

Verified for the Mercedes-Benz 420SEL

Leaks may develop from the differential seals and/or cover on older or high mileage vehicles. Our technicians recommend a complete reseal of the differential unit when these leaks are addressed.

2 Reports
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