Question about 2000 Audi A6

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My audi a6 keeps overheating at leat thats what the gauge tells me. It only happens when you are doing 40 or more . When you free wheel the temp shoots back down rapid. Any ideas

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  • donaldgorman Apr 12, 2009

    didnt

  • donaldgorman Apr 12, 2009

    didnt think

  • donaldgorman Apr 12, 2009

    didnt think so

  • donaldgorman Apr 12, 2009

    didnt think so as

  • audieurope May 11, 2010

    Either your water pump is giving up or your thermostat is bad..

  • Dave  C
    Dave C May 11, 2010

    Trust me, you do really. How many miles on this car?

  • Dave  C
    Dave C May 11, 2010

    Trust me, you do really.

  • Dave  C
    Dave C May 11, 2010

    Trust me, you do.

  • Dave  C
    Dave C May 11, 2010

    You need a radiator.

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  • Audi Master
  • 22,156 Answers

Another difficult one to diagnose without car in front of me iam afraid ,could be anything from a head gasket to a partially blocked rad caused by no ANTIFREEZE ,try it again and turn the heater on max heat and fan on max and see if runs hot then if its ok ,let engine cool and put about 200grms of caustic soda in rad and run it for half hour ,let it cool and flush out the system with a hose pipe .then refill with water and try another drive ,if its ok then refill with antifreeze ,if its not try the caustic again .if that doesnt work trade it in quick

Posted on Aug 16, 2009

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