1990 Mercedes-Benz 420SEL Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Mercedes-Benz 420SEL
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1990 Mercedes-Benz 420SEL ProblemsAC hoses may leak
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.
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.
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.
1990 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