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2004 Chevy Monte Carlo gauges and heater

Tiny
CBENTZ50
  • MEMBER
  • 2004 CHEVROLET MONTE CARLO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
My temp gauge and speedometer are not working properly. The temp gauge is always showing that the engine is running hot, the speedometer does not always register the speed. Sometimes the speedometer reads 50 or 60 when the car is idle. The heater is only expelling cold air until the engine is warm. After the engine heats up the air is warmer but not as hot as it should be.
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Friday, November 27th, 2009 AT 3:13 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If I had to guess, I would say the two things are not related. Are you sure the coolant is full? Also, when the engine is running, hot, and the heater on high, are both heater core hoses hot? Finally, has the coolant ever boiled over?

As far as the speedo, it sounds like there is a problem with the vehicle speed sensor (VSS). It is the sensor that tells the speedo how fast the car is moving. Many times it will set a "Check Engine" light. Has that ever happened?
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Saturday, December 5th, 2009 AT 7:23 PM

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