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Mercedes-Benz preventive maintenance repair questions and answers

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  • 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;
  • melvin6
    melvin6 - 2000 Mercedes Benz E430 - Preventive Maintenance - 8/10/2013
    My digital dash elements in the cluster of this vehicle has had malfunctions at the outside temperture readings and
    clock for approximately five years I need a repair service and approximate cost in Harford County. Please respond with any assistance to [email protected]
  • graycjones
    graycjones - 1982 Mercedes Benz 300TD - Preventive Maintenance - 7/30/2013
    Where is the air filter for the heater @ air cond @ how do I replace it ?
    air filter location ?
    • Jimm
      7/30/2013 Jimm
      No listing for the cabin air filter for the '82 model Mercedes 300TD. Check the vehicle owners manual to see if equipped with a cabin air filter - not all vehicles have them.

      Check the many on-line auto parts sources, such as;,, - to list only a few - for the replacement parts.
  • Junior
    Junior - 2000 Mercedes Benz ML320 - Preventive Maintenance - 7/28/2013
    I have a 2005 Toyota Highlander with 110000K miles. What do I need to change in a Tune up
    I have a 2005 Toyota Highlander with 110000 K. What do I need to change in a tune up?
  • mra_2535
    mra_2535 - 2007 Mercedes Benz C230 - Preventive Maintenance - 7/16/2013 a/c comperessor positive wire haven voltaj.i was checked every fuses but nothing happened.a/c light is on
    130000 mile cheking fuses
    • wbrockstar
      7/16/2013 wbrockstar
      There should also be a relay for the ac too.It also needs to be checked
  • karl
    karl - 1997 Mercedes Benz S320 - Preventive Maintenance - 7/9/2013
    About a quarter tank of water found in gas tank sugested fuel pump be replaced injectors ok
    i was told that the gas tank needs to be revoved and drain along with fuel pump replacement injectors seam to be ok
  • tomwde007
    tomwde007 - 2003 Mercedes Benz E500 - Preventive Maintenance - 6/23/2013
    Where is the washer pump located on my vehicle
    • Jimm
      6/23/2013 Jimm
      Remove the passenger front wheel. Then, towards the front of the vehicle, remove the inner fender well cover. The washer pump is behind a plastic liner. There are a couple 8mm nuts and at the bottom of the liner, in front of the tire, below the headlight location there are two compression pin connectors to pop out. The liner is actually 2 liners, a front half and a rear half. I think you'd only need to play with the front half.

      The washer motor and pump runs both the headlight and the windshield washers. Check the many on-line auto parts sources, such as;,, or for the replacement parts. For example, they (RockAuto) list the washer pump from around $5.00 for your vehicle.
  • oscarito52
    oscarito52 - 1992 Mercedes Benz 500SL - Preventive Maintenance - 6/6/2013
    How to take winshield wiper mechanism
    • Jimm
      6/6/2013 Jimm
      Need more information - are you referring to the windshield wiper motor? The windshield wiper linkage? The windshield wiper blade or arm?
  • douglanders
    douglanders - 2006 Mercedes Benz R500 - Preventive Maintenance - 6/5/2013
    Where is the air filter located?
    Car runs rough intermittently
    • Jimm
      6/5/2013 Jimm
      The engine air intake filter is located under the hood, just ahead of the engine. There will be a square or rectangular housing - which contains the air intake filter for the engine. This part is very easy to replace.

      Check the many on-line auto parts sources, such as; www.autopartswarehouse,, or for the replacement parts.