coolant gauge pegged high not overheated.

Discussion in '2005+ Mustang GT 4.6L Tech' started by Mustangk, Apr 18, 2021.

  1. Mustangk

    Mustangk Junior Member

    seemed as tho my cooling gauge pegged to high and the car wasnt really hot ? i took off the cap coolant and there was some smoke but that seems normal for taking the cap off right after shutting engine i couldnt get the cooling gauge off peg high until i pulled off the negative terminal to reset battery short term memory, got back in car and gauge was unpegged all the way back to the left. started it up and the gauge went to where its supposed to.

    What could be the reason this happens ? im assuming its wiring in or around the cluster for the cooling gauge or the stator motor behind the cooling gauge
  2. eighty6gt

    eighty6gt forum member

  3. Dino Dino Bambino

    Dino Dino Bambino I have a red car

    It's pretty common for the gauge stepper motors to go bad. If you plug in an ELM 327 Bluetooth OBD II scanner and pair it up to an app such as Car Scanner that you can download onto your smartphone, you can monitor live data and even set up a set of your preferred gauges (including cylinder head temperature) on the electronic dashboard. This will confirm whether your car's temp. gauge reading is true or false.
  4. stkjock

    stkjock ---- Madmin ---- Staff Member Administrator Super Moderator S197 Team Member

    Smoke, steam... same thing... :)
  5. Grabber_Mike

    Grabber_Mike Junior Member

    you have a bad coolant temp sensor or a wiring problem. Temp sensor is do it yourself $20-$30 fix.
  6. 86GT351

    86GT351 forum member

    Could be a temp sensor. Just a suggestion. Don't open the reservoir when first shutting off vehicle. Coolant gets very hot and burns badly!
    Iceman62 likes this.
  7. Iceman62

    Iceman62 Bullitt 6005

    You say car wasn't really hot...and you removed cap shortly after shut-off (w/o bad repercussion). How long was engine running? Did the gauge max right away, or gradually?
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