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The thermostat for your 2015 Chevrolet Colorado can be found beneath the housing near the water pump. You can purchase a new one, along with the housing assembly, from AutoZone for approximately $40, specifically the Duralast 93103. Replacing the old thermostat with the new one is a straightforward process involving disconnecting the engine harness wires, unscrewing the old one, screwing in the new one, and reattaching the wires. Signs of a failing thermostat include engine overheating or the temperature gauge not showing any reading, often triggering a check engine light and a related diagnostic code.
The thermostat on the 2015 Chevy Colorado can be found under a cover close to the water pump on the cylinder head.