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Mercedes-Benz preventive maintenance repair questions and answers

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  • MS
    MS - 1984 Mercedes Benz 380SE - Preventive Maintenance - 8/29/2014
    What part is needed or available to help start the car in cold weather
    I have an old friend and she says the car won't start in cold weather
    0 answer
  • AutoMD Member
    AutoMD Member - 1988 Mercedes Benz 300E - Preventive Maintenance - 7/8/2014
    Fuel, oil and water gauge not working
    the fuel gauge and oil and water gauge does not work they do not move at all, everything else on dash works
    0 answer
  • AutoMD Member
    AutoMD Member - 2001 Mercedes Benz S500 - Preventive Maintenance - 7/4/2014
    After changing the right front signal bulb the computer said right signal not working .
    mileage 112,000 I went on-line and order the bulb from autohaus AZ part number 0015449394. the signal light blink at twice the speed it should.
    0 answer
  • Mobalufon
    Mobalufon - 1989 Mercedes Benz 300E - Preventive Maintenance - 5/6/2014
    1989 Benz 300E 6cyl; New Benz battery completely drained; left high beam on 4+ hrs; jump-starts, idles some but dies
    No baterry problems before this day; Car started fine that day; ran errands all day! stopped to park the car and immediately it would not start - just to move re-park the car; discovered I left my hi-beam on all day; recently, automatic windows cricking and ...
    • GT500Knights
      5/6/2014 GT500Knights
      If the alternator is only putting out 12 volts, that is likely your problem right there. Alternator output should be between 13.5-15 volts for proper battery charge. If you left your lights on all day, and drained the battery too much, you may have destroyed a battery cell. A battery load test and alternator load test should verify which is the culprit.
      The window issue is most likely the window motor going bad. Check window motor; also check window motor regulator to make sure it is not binding on anything (which may cause the window motor to overheat and stop working briefly)
  • rabkool
    rabkool - 2006 Mercedes Benz E350 - Preventive Maintenance - 5/6/2014
    The driver side vents blow hot air when I turn the AC on whereas the vents in the midlle blow cool air as expected.
    What part of the AC system is not working???
    • alex
      4/12/2014 alex
      their is a door in the heat a/c systome that isn't functioning properly. they are controlled by little electric motors
    • GT500Knights
      5/6/2014 GT500Knights
      Check the r134a charge level of the system. An improper charge level will cause boil-off in the evaporator to occur improperly, sometimes causing one side of the car to blow cold air while the other side blows hot. Also refer to what Alex said, he also has a good point. I have seen the same situation he describes happen on a jeep.
  • AutoMD Member
    AutoMD Member - 2001 Mercedes Benz C240 - Preventive Maintenance - 5/6/2014
    Why will aircondition stop working
    aircondtion does not come on when turned on
    • GT500Knights
      5/6/2014 GT500Knights
      This is usually caused by a leak in the system. If the r134a level is too low, the compressor will not cycle on. Could also be due to numerous other problems such as belt tension too loose, climate control unit faults, blown fuses or faulty relays, or an improperly working air conditioning compressor clutch.
  • Noah
    Noah - 1983 Mercedes Benz 300SD - Preventive Maintenance - 5/6/2014
    When i turn on the engine the wiper arms keep on running?
    • GT500Knights
      5/6/2014 GT500Knights
      Check for a short in the switch or relay that controls the wiper motors
  • AutoMD Member
    AutoMD Member - 2004 Mercedes Benz C230 - Preventive Maintenance - 3/26/2014
    Fuel Gauge not working
    I had 1/2 a tank of gas and when I started car and pulled off the gauge just dropped to empty. Is this a blown fuse? If so how do I change it?
    • HouseCallAuto
      3/26/2014 HouseCallAuto
      Its not a fuse and you will not be able to do any diagnostics on this MB related to the fuel gauge unless you have a MB experienced mechanic that owns a full function MB compatible scan tool. MB vehicles are rather unique with diagnostics and special tools and most techs cannot handle electronics diagnostics on them because of a lack of diagnostic equipment. The equipment is expensive and few shops buy it and if one tries to fix stuff without this equipment, faulty conclusions are drawn most times.
  • AutoMD Member
    AutoMD Member - 1998 Mercedes Benz S320 - Preventive Maintenance - 1/31/2014
    Climate Control Fan won't turn off. Replaced Blower Motor Resistor 3 times. Could it be Blower Motor and Why?
    What makes the resistor stop working? I have tried to reapply the special grease used to ground the resistor to the motor both after and before problems arose.
    • HouseCallAuto
      1/31/2014 HouseCallAuto
      If the blower motor itself is drawing an axcessive amount of amperage it will burn up the resistor. If you have a connection either at the blower motor or at the resistor that is burned / scorched / melted - that poor connection can cause a resistor burnup as well.
  • angel laureano
    angel laureano - 2012 Mercedes Benz Sprinter 3500 - Preventive Maintenance - 1/3/2014
    Diesel filter service
    Possibility water on filter
    • Jimm
      1/3/2014 Jimm
      Need more information - what exactly is the question in regard? Is there a question about how to replace the fuel filter? Is there a question in regard to the cost?

      If there is a question in regard to how to perform this maintenance step - then check the AutoMD website and search 'Preventative Maintenance' for similar vehicles.
  • Heidi C.
    Heidi C. - 2004 Mercedes Benz E500 - Preventive Maintenance - 11/22/2013
    What is causing the instrument panel to blink red rights on either side & beep?
    It sounds like a radar detector but there isn't one installed in my car. It's a constant beeping.
    • HouseCallAuto
      11/22/2013 HouseCallAuto
      If you have your owners manual you may want to read about the meanings of indicators on the instrument panel of your MB as often the best description of the meaning is right in the manual. It is likely that there are fault codes stored in the various modules of your MB but without a proper scan tool you will be unable to read them. I just bought an SL550. I am a mechanic 37 years. I am investing in a $600 MB star tester (Chinese knockoff) so I can read all data and never get caught needing to take car to dealer because the dealer will make a MB owner pay a ton of money for services. If you do any of your own work on this car I suggest you do the same unless you are not mechanical and cannot deal with the diagnostic details.
  • Sheila
    Sheila - 1999 Mercedes Benz E320 - Preventive Maintenance - 11/8/2013
    Oil gasket pan leaking
    is this really the oil gasket pan or may be something else and how to fix it?
    • HouseCallAuto
      11/8/2013 HouseCallAuto
      Again, if the PCV system is non-functioning because of sludge buildup the engine builds up internal pressure and this makes things purge oil, things that would not normally leak oil are only leaking because there is positive pressure PSI forcing the leak. That can include the oil pan gasket, valve cover gaskets, seals etc.
  • nichols_bobby
    nichols_bobby - 2001 Mercedes Benz E320 - Preventive Maintenance - 10/10/2013
    Where is blinker relay located
    the left blinker won't go off unless I turn the inition off
    • HouseCallAuto
      10/10/2013 HouseCallAuto
      The turn signal switch is junk. Probability here is 99.9%.
  • tojojfj538
    tojojfj538 - 1988 Mercedes Benz 560SL - Preventive Maintenance - 8/30/2013
    Electric antenna not going up or down when I turn my radio on/off
    My antenna does not extend all the way up or down. How do I fix it?
    • CVO
      8/30/2013 CVO
      Check to see if there is a 12 volts going to the retractable antenna motor ( RAM ). if there is a 12 volts, then the RAM is broken, replace the whole unit.
  • jpralph
    jpralph - 2012 Mercedes Benz GL450 - Preventive Maintenance - 8/22/2013
    What is a Service A?
    Is there an additive for the catalytic converter & where does it go & how often?
    • Jimm
      8/21/2013 Jimm
      Mercedes Benz Service A, Mercedes A Service

      Mercedes Benz Service A Covers the Following and at the local dealership runs nearly $300 with tax!

      - Inspect and record tread depth, and correct tire pressure
      - Rotate tires (excludes AMG, Sports Models, SLK, and vehicles with staggered wheels)
      - Engine oil change and oil filter replacement
      -Includes Mobil 1 synthetic oil
      - Lubrication service
      - Includes hood hinges, lock cylinders, striker
      plates, sun roof tracks and top off all fluids
      - Cooling system inspection
      - Includes antifreeze protection level, hoses and
      - Brake inspection
      - Includes check of pad thickness and condition of
      discs, fluids and lines
      - Inspect heating and ventilation dust filter, replace if needed. (Replacement additional. Dust filter prices vary by model)
      - Function check
      - Includes warning lamps, headlights, exterior
      lights, seat belts, windshield wiper and washer
      - Inspect and lubricate throttle linkage
      - Check and clean air filter
      - Reset flexible service system counter

      Anything that is not acceptable under Check or Inspect of course costs more to actually repair these items.

      So, basically this is a $300 oil change, plus the checking of everything that you should normally do when changing your oil to make sure that your car is in tip top condition, plus a tire rotation and resetting the FSS light.
      So if you are pretty handy, have some basic tools, and a repair manual you can easily do this job yourself and save.
      8/22/2013 jpralph
      Thank you for the information. Do you know where I can find a repair manual for the 2012 GL450?
      I have been looking & can't seem to find one anywhere.
      Thanks again,
    • Jimm
      8/22/2013 Jimm
      For the repair and service manuals, try these sources;,

      For the vehicle owners manual;