How to change a thermostst

NOTICE: When adding coolant, it is important that you use DEX-COOL (orange colored, silicate free) coolant meeting GM Specifiction 6277M. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner - 50 000km (30,000 miles) or 24 months.

REMOVE OR DISCONNECT

Air cleaner and duct assembly.
Partially drain coolant.
Radiator hose from thermostat housing.
Thermostat housing attaching bolts.
Thermostat housing.