Where is the thermostat on a 2000 gmc sonoma?

On a 2000 GMC Sonoma, the thermostat is located in the engine compartment, typically at the engine end of the upper radiator hose. To access it, you'll need to remove the hose and the thermostat housing, which is usually held in place by a couple of bolts. It's important to let the engine cool before attempting to replace the thermostat to avoid burns from hot coolant.