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1990 Mercedes-Benz 350SDL Problems

Find the most common issues based on 1990 Mercedes-Benz 350SDL owner complaints.
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Most Common 1990 Mercedes-Benz 350SDL Problems

Fuel leaks can develop around the high pressure fuel injection pump.
The instrument cluster, along with the turn signal and wiper combination switch, can fail.
Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.
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2 Known 1990 Mercedes-Benz 350SDL Brakes Problems

As brake fluid becomes dirty over time, it can cause a failure of the anti-lock brake system (ABS) modulator assembly. Our technicians recommend a complete brake system flush every two years to hel...
The brakes may begin to squeak at about the 50 percent wear point. This is due to the size and material used for the brake pads and rotors. The brake rotor surfaces become uneven, causing a lip t...

4 Known 1990 Mercedes-Benz 350SDL Drive Train Problems

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...
High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.
Leaks may develop from the differential seals and/or cover on older or high mileage vehicles. Our technicians recommend a complete reseal of the differential unit when these leaks are addressed.

2 Known 1990 Mercedes-Benz 350SDL Electrical & Lights Problems

The instrument cluster, along with the turn signal and wiper combination switch, can fail.
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.

2 Known 1990 Mercedes-Benz 350SDL Engine Problems

Fuel leaks can develop around the high pressure fuel injection pump.
Oil leaks can develop around the oil filter housing.

0 Known 1990 Mercedes-Benz 350SDL Exhaust & Emissions Problems

5 Known 1990 Mercedes-Benz 350SDL Heating & Air Conditioning Problems

The expansion valve can get stuck and is difficult to replace.
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
The climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly re...

0 Known 1990 Mercedes-Benz 350SDL Maintenance Problems

2 Known 1990 Mercedes-Benz 350SDL Miscellaneous Problems

Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.
One or more door windows may stop working due to a failed window regulator. Replacement of the failed regulator will be necessary to correct this concern.

4 Known 1990 Mercedes-Benz 350SDL Suspension & Steering Problems

On high mileage vehicles, rear spring wear may cause the rear end to sag.
Power steering hoses and components can develop leaks.
The tie rod ends, idler arm, and/or drag link components of the steering linkage may wear prematurely. Please keep in mind the wheel alignment should be checked and adjusted when any of these i...

21
Known 1990 Mercedes-Benz 350SDL Problems & Complaints

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 climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly re...
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
One or more door windows may stop working due to a failed window regulator. Replacement of the failed regulator will be necessary to correct this concern.
A worn steering dampening shock can cause a fluid leak at the front of the vehicle. If a leak is noted from the dampening shock, our technicians tell us that it should be replaced.
The bushings for the shifter lever wear out to the point where they break and fall out. This causes excessive movement (loose feel) in the shifter lever and a clanging-type noise when changing gears.
High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.
Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.
The tie rod ends, idler arm, and/or drag link components of the steering linkage may wear prematurely. Please keep in mind the wheel alignment should be checked and adjusted when any of these i...
The brakes may begin to squeak at about the 50 percent wear point. This is due to the size and material used for the brake pads and rotors. The brake rotor surfaces become uneven, causing a lip t...
Leaks may develop from the differential seals and/or cover on older or high mileage vehicles. Our technicians recommend a complete reseal of the differential unit when these leaks are addressed.
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...
As brake fluid becomes dirty over time, it can cause a failure of the anti-lock brake system (ABS) modulator assembly. Our technicians recommend a complete brake system flush every two years to hel...
Power steering hoses and components can develop leaks.
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.
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