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1991 Mercedes-Benz 300SE

Transmission Oil Seals May Leak on High Mileage Vehicles

Verified for the Mercedes-Benz 300SE

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

 

9 Reports

Power Window May Fail Due to Window Regulator

Verified for the Mercedes-Benz 300SE

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.

8 Reports

Squeaking/Worn Brake Pads May Require Rotor Replacement Also

Verified for the Mercedes-Benz 300SE

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).

4 Reports

Noise and/or Smoke From Drive Belt Area

Verified for the Mercedes-Benz 300SE

The emissions air injection pump can seize, causing a loud squealing noise followed by smoke from the drive belt. If the engine is not turned off, the belt will break, turning on the alternator/battery warning light.

4 Reports

Excess Free Play in Steering and/or Alignment Issue

Verified for the Mercedes-Benz 300SE

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.

4 Reports

ABS Modulator Failure Due to Dirty Brake Fluid

Verified for the Mercedes-Benz 300SE

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.

4 Reports

Cracked Driveshaft Flex Discs May Cause Driveshaft Movement/Vibration

Verified for the Mercedes-Benz 300SE

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.

4 Reports

Engine Oil and Coolant Leaks Resulting in Fulid Intermix

Verified for the Mercedes-Benz 300SE

Internal and External engine oil & coolant leaks can develop from the head gasket and/or timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix which can result in severe engine damage.

4 Reports

Instrument cluster lenses may break

Verified for the Mercedes-Benz 300SE

Instrument cluster lenses break easily.

4 Reports

Coolant Leak/Overheating Due to Radiator Leak

Verified for the Mercedes-Benz 300SE

A coolant leak may develop form the Radiator due to degradation of its plastic components. Replacement of the failed radiator will be necessary.

4 Reports

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

Verified for the Mercedes-Benz 300SE

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

4 Reports

Coolant Hoses May Fail Unexpectedly

Verified for the Mercedes-Benz 300SE

The cooling system hoses may fail unexpectedly. The hoses can look good on the outside, but the rubber can degrade and erode on the inside. If not carefully checked, the hoses can burst at any time.

4 Reports

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

Verified for the Mercedes-Benz 300SE

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.

4 Reports

Check Belt Tensioner When Replacing Water Pump

Verified for the Mercedes-Benz 300SE

A coolant leak may develop from the water pump. When replacing the water pump, the drive belt tensioner should be inspected and most likely replaced as well.

4 Reports

Fluid Leak From Front of Vehicle

Verified for the Mercedes-Benz 300SE

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.

4 Reports

High Usage Vehicles May Experience Ignition Lock and Tumbler Failures

Verified for the Mercedes-Benz 300SE

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.

4 Reports

The Differential May Develop Leaks From the Seals or Cover

Verified for the Mercedes-Benz 300SE

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.

4 Reports

Shifter Lever Bushings May Break Causing Loose Feel/Noise

Verified for the Mercedes-Benz 300SE

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.

4 Reports

Rough Running Engine Due to Misfire

Verified for the Mercedes-Benz 300SE

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.

3 Reports

Failure of EHA valve may cause fuel/engine problems

Verified for the Mercedes-Benz 300SE

Fuel leaks, erratic or rough engine operation, and fuel economy issues can be caused by the failure of a fuel system component called the EHA (electro-hydraulic actuator) valve.

3 Reports

Part that attaches distributor rotor to camshaft may break

Verified for the Mercedes-Benz 300SE
The part that attaches the distributor rotor to the camshaft can break; the starter will still crank, but the engine will not start.
3 Reports

Instrument Cluster, Turn Signal/Wiper Combination Switch May Fail

Verified for the Mercedes-Benz 300SE

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

3 Reports

Motor Mounts Fail and Cause Vibration in Body

Verified for the Mercedes-Benz 300SE

Motor mounts commonly fail, causing engine vibrations to be transferred to the body. Failed motor mounts should be replaced in order to prevent damage to the transmission mount.

3 Reports

Premature Tire Wear Due to Cracked Lower Control Arm Bushings

Verified for the Mercedes-Benz 300SE

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.

2 Reports

Expansion valve may get stuck

Verified for the Mercedes-Benz 300SE
The expansion valve can get stuck and is difficult to replace.
2 Reports

Worn seat springs/padding may cause lean or sag

Verified for the Mercedes-Benz 300SE
The seat springs and padding break down over time, causing a lean, tilt, or sag.
2 Reports

AC Not Cold Due to Leaking Hose

Verified for the Mercedes-Benz 300SE

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.

2 Reports

Early-style stainless steel fuel injectors may develop fuel leaks

Verified for the Mercedes-Benz 300SE

Early-style stainless steel fuel injectors may develop fuel leaks. On high mileage vehicles, the fuel distributor may leak.

2 Reports

Improper Temperature Output From HVAC

Verified for the Mercedes-Benz 300SE

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.

2 Reports

Fuel system components may leak and cause hard starting problems

Verified for the Mercedes-Benz 300SE
Leaks from the fuel pressure accumulator or a faulty cold start fuel injector (fuel system components) can cause hard starting problems.
2 Reports

Glove box hinges may break

Verified for the Mercedes-Benz 300SE
Glove box hinges are known to break.
2 Reports

Interior Wood Trim Cracks Due to Age and Sun Exposure

Verified for the Mercedes-Benz 300SE

Due to age and sun exposure, the interior wood trim cracks and the finish gets a cloudy haze. Replacement if the trim would be the most common solution to the problem.

2 Reports

"No start" Caused by Failed Fuel Pump/Relay

Verified for the Mercedes-Benz 300SE

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 Reports
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