- 5mm Allen key (hex key)
- Flathead screwdriver
- Funnel
- Container to catch old coolant
Instructions:
1. Park your vehicle on a level surface and allow the engine to cool down completely. This is important to prevent scalding yourself with hot coolant.
2. Open the hood of your vehicle.
3. Locate the thermostat housing. On the 2001 Pontiac Montana, it is located on the front side of the engine, just below the upper radiator hose.
4. Loosen the worm-gear clamp on the upper radiator hose. Use the 5mm Allen key to turn the screw on the clamp counterclockwise until it loosens.
5. Pull the upper radiator hose off of the thermostat housing. Be careful not to spill any coolant. If necessary, use a container to catch the old coolant.
6. Remove the two 10mm bolts that hold the thermostat housing in place. Use a flathead screwdriver to remove the screws from the housing.
7. Lift the thermostat housing off of the engine. The thermostat will be located inside the housing.
8. Remove the old thermostat from the housing. Use the flathead screwdriver to pry the thermostat out of the housing.
9. Inspect the old thermostat. Look for any signs of damage, such as cracks or leaks. If the thermostat is damaged, it should be replaced.
10. Install the new thermostat in the housing. Make sure that the thermostat is seated properly in the housing.
11. Replace the thermostat housing on the engine. Secure the housing with the two 10mm bolts.
12. Reconnect the upper radiator hose to the thermostat housing. Secure the hose with the worm gear clamp.
13. Add coolant to the engine. Use the funnel to add coolant to the engine until it reaches the full mark on the coolant reservoir.
14. Close the hood of your vehicle.
15. Start the engine and let it run for a few minutes. Check for any leaks from the thermostat housing. If you see any leaks, tighten the bolts that hold the housing in place.
