1990 Mercedes-Benz 300E 4MATIC Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Mercedes-Benz 300E 4MATIC
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1990 Mercedes-Benz 300E 4MATIC ProblemsBlend Doors in HVAC May Stop Working Due to Bad Vacuum Actuators
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.
A vibration felt through the center floor of the vehicle can be caused by driveshaft flex discs, which crack and shred, causing excessive driveshaft movement. Not repairing these can cause damage to the driveshaft center support bearing, or, in the worst case scenario, damage to the transmission or differential.
High mileage or older vehicles commonly develop leaks from the differential seals and/or cover. Our technicians recommend a complete reseal of the differential unit whenever these leaks are repaired.
1990 Mercedes-Benz 300E 4MATIC QuestionsMuffler wont stay up on car (1 answer)
have taken car back to shop about 10 times they keep putting new clamps on muffler but it will only hold it up for a short time i think its the wrong muffler but they say not