Why would my engine be running hot?

Asked by Reid Jun 13, 2023 at 09:24 PM about the 2008 Chevrolet Colorado LT Crew Cab 4WD

Question type: Maintenance & Repair

I have a 2008 Chevy Colorado with a 3.7 lt engine, I've done a coolant flush



and replaced the thermostat. Runs hot after 20 minutes. Doesn't blow white



exhaust and water pump isn't screaming. What could be happening?

3 Answers
311,505

Gene answered about a year ago

Sounds like a restriction in the cooling system, most likely a bad radiator. You can used one of those later heat sensors and run a sweep of the temperature across the radiator. You can see hot and cold spots of a bad radiator.

Mark helpful

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