Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or closed toe shoes.
Open the hood and locate the vehicle's radiator.
Remove the vehicle's radiator cap and use a radiator pressure tester to check for leaks.
Drain out some of the engine coolant in the radiator so the coolant level is below the thermostat housing to prevent leaking when replacing the thermostat.
If necessary, remove the upper radiator hose.
Remove the thermostat housing bolts.
Remove the thermostat housing.
Remove the thermostat.
Clean the mounting surfaces. Install the new thermostat as it was removed and always use a new thermostat gasket.
now you can replace the old housing at this time with your new one
Reinstall thermostat housing and tighten mounting bolts evenly. If applicable, reconnect the upper radiator hose.
Refill the cooling system with coolant.
Start the vehicle with the radiator cap off and allow the engine to run for several minutes. This allows the air bubbles to escape the cooling system.
Reinstall the radiator cap.
Run the engine until up to normal operating temperature. Remember to keep an eye on the temperature gauge to prevent overheating.