Mercedes-Benz 300SL Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Mercedes-Benz 300SL

No_car_image
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
Get a Repair Estimate For Your Mercedes-Benz 300SL
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more

Mercedes-Benz 300SL Problems

Bad 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.

Poor AC Performance Due to Refrigerant Loss

A refrigerant leak may develop from one or more of the following AC components: AC compressor, hose manifold for the compressor, or the evaporator core. The loss of refrigerant can cause poor AC performance. Our technicians tell us that proper leak diagnoses should be performed in order to determine the cause of any refrigerant loss.

Rough Running Engine Due to Misfire

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.

See More Problems (29)

Mercedes-Benz 300SL Questions

My 300SL has stalling problems at all speeds.This is dangerous. (1 answer)

The car also has hard start problems and spongy brakes.The stalling problem occurs most at high speed when decelerating.The car runs fine otherwise.It does not leak oil or any other fluids.

Where are the fuses located (2 answers)

1991 300 sl has spark ignition fuel compression is in time cranks but wont start (1 answer)

was running great parked for a week would not start. replaced distributor cap and rotor, cam and crank position sensors. ecm and ezl checked all fuses has correct fuel pressure showed code for oxygen sensor which was also replaced along with ignition switch. mechanic has gave up on vehicle

See More Questions (77)

Mercedes-Benz 300SL Reviews

I bought my 1992 300SL 5 months ago,May of 2016.and from the start while driving the car from CA to WA it had rough start problems.The brakes were spongy and even after having the master cylinder replaced and the entire brake system checked twice the brakes are still spongy.The factory radio failed long ago and I replaced it with an aftermarket unit.But the most chronic problem of all is high s...
air conditioner not cold blowing cool
my 1991 300 sl was experiencing symptoms of running fine when cold, and breaking up and stalling when engine got warm. changed crank sensor, no fix, still getting stuck on many occasions. car wold only start when it cooled off. thought it had to do with some kind of temperature sensor..changed fuel filter, and the problem went away. driven hundreds of miles trouble free now..car often sits for ...

See More Reviews (9)