Temperature Gauge Not Reading Correctly - Second Generation Pontiac Firebird (1970 - 1981) - Firebird Nation

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Temperature Gauge Not Reading Correctly

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#1 rosseich


    Firebird Newbie

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  • Gender:Male
  • First Name:Ross
  • City:Victoria
  • State or Province:MN
  • Country:USA
  • Year: 1970
  • Make: Pontiac
  • Model: Trans Am
  • Engine: 400
  • Transmission: Manual

Posted A week ago

I have a '70 Trans Am with the original Ram Air III engine.  My temperature gauge is reading to low (just over 100 degrees on the gauge).  The thermostat is working since the engine is running at a normal temperature (after driving the car the manifold and head temperature is between 195 and 205 degrees.  I have the original temperature sending unit in the car so I'm thinking it may be had.  I have tried two different dash gauges and get the same reading.



#2 myk74


    Firebird Tune up Technician

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  • First Name:Mike
  • City:Bryan
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  • Year: 1974
  • Make: Pontiac
  • Model: Firebird
  • Engine: 350
  • Transmission: TH400

Posted A week ago

My guess would be the sending unit. What happens when you ground the sending unit wire? The gauge should peg to max I believe.


Also, the sender has to be in contact with the liquid coolant. If water passage is blocked, or the sender is coated with funk,  that would cause problems too

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