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1991 Mercedes-Benz 350SD Problems

 

Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor

Verified for the Mercedes-Benz 350SD

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

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"No start" Caused by Failed Fuel Pump/Relay

Verified for the Mercedes-Benz 350SD

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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Climate Control System Problems Due to Wear in Climate Control Buttons Contacts

Verified for the Mercedes-Benz 350SD

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 required to correct this problem.

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Power steering hoses can develop leaks

Verified for the Mercedes-Benz 350SD

Power steering hoses and components can develop leaks.

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AC Not Cold Due to Leaking Hose

Verified for the Mercedes-Benz 350SD

A refrigerant leak may develop from one or more of the AC hoses. Proper leak detection procedures should be followed if refrigerant loss in encountered. Replacement of any leaking hoses will we required to restore proper AC operation.

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Transmission Oil Seals May Leak on High Mileage Vehicles

Verified for the Mercedes-Benz 350SD

High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.

 

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Fluid Leak From Front of Vehicle

Verified for the Mercedes-Benz 350SD

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.

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Instrument Cluster, Turn Signal/Wiper Combination Switch May Fail

Verified for the Mercedes-Benz 350SD

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

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ABS Modulator Failure Due to Dirty Brake Fluid

Verified for the Mercedes-Benz 350SD

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 help prevent this issue.

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Excess Free Play in Steering and/or Alignment Issue

Verified for the Mercedes-Benz 350SD

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 items are replaced.

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Improper Temperature Output From HVAC

Verified for the Mercedes-Benz 350SD

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.

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Squeaking/Worn Brake Pads May Require Rotor Replacement Also

Verified for the Mercedes-Benz 350SD

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 to form at the outer edge. This will generally require replacement of the rotors when the pads are worn (pad life varies depending on driving style and terrain).

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The Differential May Develop Leaks From the Seals or Cover

Verified for the Mercedes-Benz 350SD

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.

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High Usage Vehicles May Experience Ignition Lock and Tumbler Failures

Verified for the Mercedes-Benz 350SD

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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Shifter Lever Bushings May Break Causing Loose Feel/Noise

Verified for the Mercedes-Benz 350SD

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.

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