• Tiny
  • blake32
  • 1999 Pontiac Montana
  • 6 CYL
  • automatic

My 1999 Pontiac Montana is leaking antifreeze. The temperature is going up and then go back down. The dashboard is cracked. It is running sluggish. I triedputting sealant block to help but nothing is working. It is shaking when it is sitting still in park. What could be the proble?

Monday, November 15th, 2010 AT 5:11 PM

1 Answer

  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

If you have a check engine light get codes read.

Have compression test performed to check head gaskets, if OK, then perform a cooling system pressure test to isolate leak.

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Monday, November 15th, 2010 AT 5:14 PM

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