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Problems for specific Mercedes-Benz 300SE years:

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Repairpal verified 1990 Mercedes-Benz 300SE problems

 

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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Verified for the Mercedes-Benz 300SE

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

 

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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.

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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.

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Verified for the Mercedes-Benz 300SE

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

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