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Cooling system

Tiny
CECILIA BELL
  • MEMBER
  • 2006 CADILLAC STS
  • V8
  • RWD
  • AUTOMATIC
  • 214,000 MILES
Car is overheating. We replaced the radiator still over gear changed the hose, water pump and thermostat. Still over heating. It is holding the radiator fluid now but when we tighten the radiator cap it overheats, but we loosen it and keep it loose it does not over heat. We have no ideas what it is now. We changed the whole cooling system. Need help.
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Saturday, August 12th, 2017 AT 7:28 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,414 POSTS
The Northstar engine is known for head gasket problems. I suspect that is the root cause of your problem. You can rent a pressure test kit and a combustion gas detection kit from many parts stores and run those tests on the system. It should tell you if there is a gasket issue.

https://www.2carpros.com/articles/head-gasket-blown-test
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Saturday, August 12th, 2017 AT 9:34 AM

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