How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Stan Your Own Question

Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
Type Your Mercedes Question Here...
Stan is online now

I bought a Sept 2004 clk55amg 78k miles FMBSH from an indy

Customer Question

I bought a Sept 2004 clk55amg 78k miles FMBSH from an indy dealer and 2 days later the transmission failed. It seems to be that common fault of cross contamination of glycol. The supplying garage have taken the car back and are due to propose a repair plan to be done by MB in Sheffield, but not replacement of the box! How can I be sure that say a new rad, full flush of everything etc has really done the job and it will not fail on me down the track?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Shantal-Mod replied 1 year ago.
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
I was checking to see if you had already found your answer or if you still need assistance from one of the Professionals.
Please let me know if you wish to continue waiting or if you would like for us to close your question?
Thank you,
Expert:  Stan replied 1 year ago.
The repair scope depends on the concentration of glycol (coolant) in the transmission fluid. In case of light contamination, undertaken repairs are prescribed by the manufacturer.
In case of heaviest level of glycol concentration, then the transmission must be replaced.
You can ask the repairer for the glycol test paper and see what color it is and compare it to the manufacturer's repair instructions. They all have to be stored with the workshop order at the dealer.

best regards,
Customer: replied 1 year ago.
Hi Stan can you tell me what level (so what constitutes heavy?) of glycol contamination indicates replacement rather than repair? Is that measured by a colour interpretation of the paper or is it more scientific than that? Best Andy
Expert:  Stan replied 1 year ago.
Sorry, the glycol test does not prescribe the transmission replacement.
The following must be done depending on the result per manufacturer specs:

''- As of a glycol content greater than 100 mg/l. Exchange radiator, flush torque converter, lines and transmission.

If the complaint is still reproducible after the flushing routine, only the torque converter should additionally be replaced. ''

Result of the test is shown as a color of the test paper. Test itself is quite specific.
If the transmission does not exhibit any symptoms after the flush, transmission is considered to be in order by manufacturer's specifications.
Of course, if transmission gears are slipping after the flush, then the coolant has damaged clutch plates, torque converter replacement will not help.

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex

Meet The Experts:

  • Matt


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
< Last | Next >
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Marty's Avatar


    ASE Certified Technician

    Satisfied Customers:

    Bosch Certified Master Technician with over 35 years experience in the automotive industry.
  • mike_a_mechanic's Avatar


    Mercedes Mechanic

    Satisfied Customers:

    17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
  • MB Paul's Avatar

    MB Paul

    Mercedes Technician

    Satisfied Customers:

    Mercedes Benz Qualified Diagnostic Technician
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician