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Thread: E21 temp gauge problem

  1. #1
    Join Date
    May 2015
    Location
    Delhi CA
    Posts
    2
    My Cars
    1981 bmw e21

    E21 temp gauge problem

    New to bimmerforums. My temp gauge on my 81 e21 would usually run at the middle now it's getting close to 3/4 wail running. My question why is it when I turn my headlights on the gauge goes back to the middle or 1/2 mark like it would normally run. And when I turn on my fan the temp goes up a little more with each speed setting. Can anyone help me with this problem please.
    Last edited by QuikayE21; 09-01-2016 at 12:25 AM.

  2. #2
    Join Date
    Sep 2008
    Location
    West London/Heathrow - UK
    Posts
    7,204
    My Cars
    03 530dT - Ex Police Car
    Hi,

    Put this question over in the specific E21 sub section as this one is all about Car Audio and associated electronics.

    Cheers, Dennis!

  3. #3
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    Common problem in the E21. Mine had a similar issue. The ground in the dash is loose.

  4. #4
    Join Date
    Jul 2005
    Location
    Albuquerque, NM
    Posts
    214
    My Cars
    '77 turbo 320i, '07 Subi
    Yup, it's a grounding issue - sometimes it's a loose nut, and sometimes it's corrosion. After checking under the dash, check the ground at the battery as well.

  5. #5
    Join Date
    Jun 2017
    Location
    los angeles
    Posts
    52
    My Cars
    e21 320i
    Hey my does the same thing while braking or with turn signals on it starts to move my temp gauge. I want to check the grounds also do you know where they are located?

  6. #6
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    It's been years since I owned my 320i, but as I remember the ground lug is easy to get at once you remove the panel under the dash. Bring a good flashlight (torch for Dennis!!).

  7. #7
    Join Date
    Sep 2008
    Location
    West London/Heathrow - UK
    Posts
    7,204
    My Cars
    03 530dT - Ex Police Car
    Hi,

    I like being UK <> USA double linguistic and often put my 'American' to use whenever I'm Stateside! Flashlight is one word I'm familiar with over there

    E21 Luis, as per above, have a look around and also look at the E21 section for specific information or knowledge that might help ! Then, make sure you install an excellent audio system and ask here about that project

    Cheers, Dennis!

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