Locating the Coolant Temperature Sensor on a 2005 Chevy Colorado 3.5L Engine

On the 2005 Chevy Colorado with the 3.5L engine, the coolant temperature sensor (CTS) is located:

• On the driver's side of the engine, near the top of the cylinder head.
• It's a small, cylindrical sensor with a two-wire connector.
• Mounted in the coolant outlet housing, which connects to the upper radiator hose.

When replacing, ensure the engine is cool, disconnect the battery, and use a new O-ring or sealant as specified. Clear any trouble codes after installation.