Running hot. Coolant level is good. How can I tell if the thermostat is the problem?

Tiny
SHOWTIME205
  • 2000 CADILLAC DEVILLE
  • 145,000 MILES

Just changed the oil and fill my coolant. Seems like the coolant is not getting to the radiator.

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Friday, January 27th, 2012 AT 12:46 AM

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Tiny
RIVERMIKERAT
  • MEMBER

With the engine running and hot, grasp the radiator hoses. If one or both are cold, the thermostat is not opening. Also check that radiator. Is it cold or hot? Can you remove the radiator cap and see coolant flowing?

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Friday, January 27th, 2012 AT 12:56 AM

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