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300E

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Question
Headlights and taillights don't work
Hello. If both of these stopped working at the same time it is usually the switch. This is the most common failure on this car. I would usually check the wiring to the switch for voltage first before replacing the...
Question
what is the easiest way to replace the upper radiator hose?
Hey there, thanks for writing in about your 1991 Mercedes-Benz 300E. You should not have to remove any engine components to replace the upper radiator hose. The only thing that you will need to do is drain the coolant. If...
Question
Car electrical issues
The dash light may need to be replaced again. The light would need to be checked for a bad socket. The sunroof will need tested to see if the track is binding. The issue with your radio only working if...
Question
Crank but not start
Thanks for writing in about your 1990 Mercedes Benz E300. It sounds like the idle valve may be stuck closed and this could be why the engine only starts when the gas pedal is pressed. Due to the pressures generated...
Question
Power locks orthopedic seats
Both of these systems are controlled by fuse 'A' in the electrical center of your 1990 Mercedes-Benz 300E. If this fuse is blown it would prevent both the locking and orthopedic seats from functioning. I doubt it was related to...
Question
Heater and air conditioning fan stuck on low
The push button panel for your climate control is also the control unit. It uses the signals from various temp sensors to decide what to tell the climate control what to do. It also decides on the fan speed and...
Question
Backfires on start up
Backfiring can be caused by a number of faults. If the ignition timing is incorrect either by the distributor being out of alignment or a jumped timing chain, backfires can occur. Also, if ignition wires are crossed / incorrect firing...

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