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Overheating

Tiny
JERRYWINSTON336
  • MEMBER
  • 2003 PONTIAC GRAND AM
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 14,400 MILES
My car started overheating I replaced the radiator water pump thermostat coolant level sensor coolant temperature sensor serpentine belt the car is still overheAting I checked the fans they are operating properly it just keeps overheating I also checked the engine oil to see if it looked normal and it does I looked at that to see if it could be a blown head gasket problem oil looked normal
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Tuesday, April 4th, 2017 AT 7:05 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Pressure check cooling system for an internal leak like a head gasket. Then when hot check radiator with engine off and fans unable to start for cold spots if any the rad is bad
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Wednesday, April 5th, 2017 AT 7:11 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Looks like you replaced all the external parts. Run a pressure test as well as a combustion gas test. It sounds like you have a failing head gasket that is causing the overheating.
Another possibility would be a partially plugged exhaust holding heat in the engine, for that a simple back pressure test of the exhaust would rule that out.
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Sunday, April 9th, 2017 AT 1:48 PM

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