Mercedes-Benz 420SEL Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Mercedes-Benz 420SEL
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Mercedes-Benz 420SEL ProblemsBad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
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.
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.
Mercedes-Benz 420SEL QuestionsHow to replace my cabin air filter if I have one ? Thank You (1 answer)
The economy needle has gone from black all the way to red.
as soon as the car run the abs ligth in the dash goes on. in reverse the car don't do that