Mercedes-Benz 300SEL Repair and Maintenance - Get an online auto repair estimate for your Mercedes-Benz 300SEL
RepairPal gives you independent and unbiased repair estimates, user
ratings and reviews, plus advice you can't get anywhere else.
It's easy, accurate, and FREE!
Mercedes-Benz 300SEL Repair and Maintenance
Mercedes-Benz 300SEL Model Years
Mercedes-Benz 300SEL Questions and Answers
talkback27, 1990 Mercedes-Benz 300SEL, Thonotosassa, FL
I have a 1988 Mercedes Benz 300 SEL the A/C Blows Cold but you can not adjust the temperature in the car if you adjust the temperature the A/C blows hot air and you can not get cold air again until...
gavino, 1990 Mercedes-Benz 300SEL, Antelope, CA
won't start but there is power from the sparkplug. The fuel pump is working but no gas coming from in the injector. There is no power from Bosch K electronic mechanical fuel injection
gavino, 1990 Mercedes-Benz 300SEL, Antelope, CA
i need fuel pump wiring diagram.
joycee, 1990 Mercedes-Benz 300SEL, North Hollywood, CA
hi i just bought my car and they told me that it needed a new water pump if my car make a real loud squick sound when i push down the peedle what does that mean
joycee, 1990 Mercedes-Benz 300SEL, North Hollywood, CA
hi i need help cause im new to mercedes benz cars im wondering where is the fuse box locate at
Mercedes-Benz 300SEL Problems
| Brakes |
- Due to the size and materials of the brakes on these vehicles, the brakes start to squeak around the 50 percent wear point. The brake rotor surfaces become uneven, causing a lip to form at the outer edge of the rotor. Because of this, the rotors are usually replaced when the pads are worn (pad life varies depending on driving style and terrain).
- Brake fluid should be flushed every two years to prevent premature anti-lock brake system (ABS) failure.
|
| Engine |
- Oil leaks develop from the head gasket and timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix.
- The part that attaches the distributor rotor to the camshaft can
break; the starter will still crank, but the engine will not start.
- Radiators break due to degradation of the plastic tanks and fittings.
- Older vehicles should have the cooling system serviced even if the mileage is low. 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.
- The water pump can develop leaks. When replacing the water pump, the drive belt tensioner should be inspected and most likely replaced as well.
- Motor mounts fail, causing engine vibrations to transfer to the
body. The motor mounts should be replaced or the transmission mount may
fail.
- Leaks from the fuel pressure accumulator or a faulty cold start fuel injector
(fuel system components) can cause hard starting problems.
|
| Exhaust & Emissions |
- A rough running motor or lack of power can be caused by the distributor cap and rotor, bad ignition wires (or their resistors), or valve cover gasket leaks. When the valve cover gasket leaks, oil can pool where the ignition wire resistor connects to the spark plug. The resistor can fail or the spark plug not fire because of the short circuit through the oil.
- 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.
- Emissions air injection pumps can seize up, causing a loud
squealing noise possibly followed by smoke. The air pump pulley stops
turning, but the drive belt does not and this friction causes the noise and smoke. If the engine is
not turned off, the belt will snap, turning on the alternator/battery
warning light.
- Early-style stainless steel fuel injectors may develop fuel leaks. On high mileage vehicles, the fuel distributor may leak.
|
| Suspension & Steering |
- Irregular and premature tire wear can be caused by the lower
control arm bushings cracking and causing excessive movement at the control arm pivot point. Ball joints can also wear out prematurely, causing similar tire wear symptoms.
- The tie rod ends, drag link, and idler arm in the linkage of the steering system can wear out.
- There is a steering dampening shock that will leak fluid when it goes bad.
|
| Drive Train |
- A vibration felt through the center floor
of
the vehicle can be caused by driveshaft flex discs, which crack and
shred, causing excessive driveshaft movement. Not repairing these can
cause damage to the driveshaft center support bearing, or, in the worst
case
scenario, damage to the transmission or differential.
- High mileage vehicles can leak from the transmission oil seals.
- High mileage or older vehicles develop leaks
at the differential seals and cover; the whole unit needs to be
resealed to repair the leaks.
- 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.
|
| Electrical & Lights |
- The fuel pump and fuel pump relay can fail, causing the car to crank (when starting), but not start.
- The instrument cluster, along with the turn signal and wiper combination switch, can fail.
|
| Heating & Air Conditioning |
- Other than a defective motor, a bad switch or blower motor resistor assembly can cause inoperative heater blower motors.
- The climate control system can fail or perform erratically due to internal wear in the climate control unit buttons.
- The AC coolant hoses may leak.
- The expansion valve can get stuck and is difficult to replace.
- Due to the vacuum actuators going bad, temperature blend doors in the HVAC system may stop working.
|
Recent Mercedes-Benz Repair Estimates
Most Common Mercedes-Benz Repair Estimates
