Cooling system

1995 PONTIAC GRAND PRIX
150,000 MILES • 3.1L • V6
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JEFF D. GILDEA
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Car has been overheating. we have replaced radiator, hoses, thermostat, and waterpump.
Still overheating what is next?
Feb 20, 2017 at 12:26 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
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How hot does it get in degrees F? Is the coolant reservoir filling up in a hurry? Is the radiator cap okay? With the work you have done, maybe air in the system? Does the radiator fan work? I saw what you replaced, I would still want to check coolant flow. Sometimes a head gasket can cause problems.

On some makes and models, I remove radiator cap, cool engine. Start engine, if coolant level in radiator starts rising quickly, then I start worrying about a head gasket, but, I check everything else first.
Feb 20, 2017 at 12:39 PM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
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Do a pressure test on it as well as a combustion gas test. If it will not hold pressure and you do not see a leak and it fails the gas test it would point to a failing head gasket or similar.
Feb 20, 2017 at 12:39 PM
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