what would make th vehichal over heat

2001 PONTIAC MONTANA
134,000 MILES
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STROHM64
  • MEMBER
  • 1 POST
I'v changed the thermosta. The car over heats and cools itself and shoots back up all on its own, siting still or driving. with the cap off and car hot the fluid runs rite out of the cap.
Mar 30, 2012 at 8:28 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Radiator cap,water pump,blown head gasket and cracked head or block,air lock and clogged radiator and the list goes on
Mar 30, 2012 at 9:02 AM
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DJCL
  • ✓Experienced Mechanic
  • 767 POSTS
When is it over heating. Right after start up @ hi speeds @ idle ?
Mar 30, 2012 at 10:28 AM
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RUTH WINGATE
  • MEMBER
  • 1 POST
how can you tell if you have a blown head gasket?
May 3, 2012 at 4:55 AM
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DJCL
  • ✓Experienced Mechanic
  • 767 POSTS
One way is a block test kit you can get @ a parts store or use a gas analyzer to check for hc reading in the cooling system.
May 3, 2012 at 5:14 AM
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