I have a 2011 Hyundai equus and all of a sudden my temperature gauge stays on cold I checked my coolant level and it was low in which I added the correct amount and drove for awhile but temp gauge is still on cold any help would be greatly appreciated

  • Welcome to Motor Vehicle Maintenance & Repair! May 4, 2018 at 2:31
  • 2
    Does the car's motor reach operating temperature? If it does, there's something wrong with the gauge or its wiring. If it does not, I'd suspect the thermostat has failed open. May 4, 2018 at 3:36
  • @David why put this in a comment and not in an answer?
    – MadMarky
    May 4, 2018 at 7:34
  • @Mad marky, It's a guess there's not enough detail in the for a definate answer.
    – Jasen
    May 4, 2018 at 9:42
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    it sounds like the temperature sending unit...try grounding the unit wire if it moves the gauge then it is the unit Jun 4, 2018 at 1:23

1 Answer 1


Does the engine come up to operating temperature after driving it a few miles?

You can check this by feeling the upper radiator hose to see if it hot, careful not to grab it as it could burn your hand, just touch it slightly with a finger, it should be very hot.

Another way is to connect an OBD scanner to the OBD port on the car after it has run a few miles and see what the engine temp is, the ecu uses a separate engine temp sensor, if it reads 180 degrees Fahrenheit or above the engine temp gauge for the instrument cluster is bad or you may have an engine thermostat that needs replaced.

  • Thanks for the info, it was the engine temperature sensor
    – Jerod Reed
    Jun 6, 2018 at 3:32

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