Where is the thermostat on a 2004 Colorado?

On a 2004 Chevrolet Colorado, the thermostat is located in the engine compartment, typically near the engine’s front. To access it, you'll need to remove the upper radiator hose connected to the thermostat housing. The thermostat itself is housed within the thermostat housing, which is bolted to the engine block. Always ensure the engine is cool before attempting to locate or replace the thermostat.