COOLANT IS BEING FORCED BACK INTO THE RESERVOIR ...

  • Tiny
  • Anonymous
  • 1999 Pontiac Montana
  • 190,000 miles

Coolant is being forced back into the reservoir and the temperate gauge is going up and down, why?

Monday, March 4th, 2013 AT 5:15 PM

1 Reply

  • Tiny
  • caradiodoc
  • Expert
  • 25,451 posts

That's what you pay mechanics to figure out. There could be a leaking cylinder head gasket. It could be as simple as a sticking thermostat. To identify a leaking head gasket your mechanic will draw air from the coolant reservoir through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow.

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Monday, March 4th, 2013 AT 11:46 PM

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