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Thread: Car thermostat goes down after car is warmed up.

  1. #1
    Join Date
    Aug 2005
    Location
    Atlanta, GA
    Posts
    384
    My Cars
    528i sport

    Car thermostat goes down after car is warmed up.

    Just as the title states. Temperature here in Atl, GA is around 59 - 65F throughout the day. When the car is fully warmed up the needle will be at the 12 position. However, once I start driving, the needle will go back down and go far as near the blue "cold" position of the thermostat. This car is driving me crazy with all these problems. Anybody know what the problem could be?
    You can call me Rush.
    1999 528i Sport, 117K, 5K Xtec HIDs
    *Not much of a mod freak*



    http://www.ddmtuning.com FTMFW!!


  2. #2
    Join Date
    Sep 2007
    Location
    New York
    Posts
    2,108
    My Cars
    1974 2002, 2009 128i
    Likely the thermostat is stuck open.





    Life's tough. It's tougher when you're stupid.
    -John Wayne

  3. #3
    Join Date
    Nov 2005
    Location
    San Francisco, CA
    Posts
    899
    My Cars
    e39
    x2

    time for a new thermostat.

    Not a huge deal to replace and <$50 part.
    Life's difficult, and being stupid makes it more difficult.

  4. #4
    Join Date
    Feb 2006
    Location
    Newark, DE
    Posts
    68
    My Cars
    '99 528i, '91 300ZX
    Good to know, I am experiencing the same issue!

  5. #5
    Join Date
    Apr 2005
    Location
    Michigan, USA
    Posts
    2,694
    My Cars
    '02 530i manual
    Yup, sounds like a faulty thermostat.
    .

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