1. Park your car on a level surface and turn off the engine. Allow it to cool down completely before proceeding.
2. Open the hood of your car.
3. Locate the thermostat housing. It is usually a cylindrical-shaped part located near the top of the engine block.
4. Disconnect the coolant hoses. There will be two hoses connected to the thermostat housing: one coming from the radiator and one going to the engine block. Use a wrench or pliers to loosen the hose clamps and remove the hoses.
5. Remove the thermostat housing bolts. There will usually be two or three bolts holding the thermostat housing in place. Use a wrench or socket to loosen and remove these bolts.
6. Remove the thermostat housing. Once the bolts are removed, you should be able to lift the thermostat housing off the engine block. Be careful not to spill any coolant that may be inside the housing.
7. Remove the old thermostat. The thermostat is a small disc-shaped part located inside the thermostat housing. Use a screwdriver or pliers to remove it.
8. Inspect the thermostat. Check the thermostat for any signs of damage, such as cracks or leaks. If the thermostat is damaged, replace it with a new one.
9. Reinstall the thermostat and thermostat housing. Once you have inspected the thermostat, reinstall it in the thermostat housing and secure it with the bolts you removed earlier.
10. Reattach the coolant hoses. Reattach the coolant hoses to the thermostat housing and secure them with the hose clamps.
11. Refill the coolant system. If you had drained some of the coolant out of the system, refill it now using a funnel.
12. Test the thermostat. Start the engine and let it run for a few minutes to warm up. The thermostat should open and allow the coolant to flow through the engine. Check that the engine is warming up properly.
Once everything is secured and refilled, your car is ready to be driven.
