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
  • 28,859 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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