Where is the thermostat on a 2004 Chevy Colorado with a in line 5 motor?

On a 2004 Chevy Colorado with an inline 5 motor, the thermostat is located on the engine block, near the water pump. To access it, you typically need to remove the upper radiator hose, as the thermostat is housed within the thermostat housing connected to the engine. It’s advisable to consult the vehicle's service manual for specific instructions and diagrams.