1990 Mercedes-Benz 300SL Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Mercedes-Benz 300SL

1990 Mercedes-Benz 300SL Problems

Leaks at Compressor, Hose Manifold, or Evaporator Core May Cause Poor AC Performance

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.

Cracked Driveshaft Flex Discs May Cause Driveshaft Movement/Vibration

A vibration felt through the center floor of the vehicle can be caused by cracked and/or shredded driveshaft flex discs, resulting in excessive driveshaft movement. If not repaired, damage to the driveshaft center support bearing, transmission, or differential can occur.

Premature Tire Wear Due to Cracked Lower Control Arm Bushings

The lower control arm bushings can wear and crack, leading to irregular and premature tire wear. Worn Ball joints can also cause similar tire wear problems. I some cases it may be necessary to replace the lower control arm, including bushings & ball joint to correct this concern.

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1990 Mercedes-Benz 300SL Questions

I have problems with the instrument cluster. (1 answer)

The meters are going up and down sometimes. Eventually it may brake down completely some workshop guy told me.
Any tips for what to do? Is he right? What will be the price for a new or used one?

My row bar keeps coming up when I make a turn. (1 answer)

The hard top is on when I make the turn.

Where do u check for hydraulic fluid on hard top? Hard top not unlatching. (1 answer)

Red light is on.

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1990 Mercedes-Benz 300SL Reviews

Nice car but does have a number of issues after 20+ years. There is a wealth of information and help on the MB forums. The bad "green" wires came in 1994 for a few years. And, EZL's do NOT explode. (Where does this stuff come from?)
the best car I ever had
1) the electrical wire issue. Basically this makes the car a rolling wreck with it only a matter of time before they short out and your entire computer system and or EZL explodes...anyone out there care to guess how much that would cost (an EZL for this particular car is extremely expensive) I was told that the insullation was designed to be GREEN and biodegrade...which is why it falls apart......

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