Tools You'll Need:
* New Thermostat: Make sure you get the correct one for your specific engine and year.
* Sockets and Wrenches: Various sizes, likely including a socket for the thermostat housing bolts.
* Pliers: For hose clamps.
* Drain Pan: To catch coolant.
* Funnel: To refill the cooling system.
* Coolant: The correct type for your vehicle (check your owner's manual).
* Gloves: To protect your hands.
* Jack and Jack Stands (recommended): For safer access.
* Rags or Shop Towels: To clean up spills.
Procedure:
1. Safety First: Let the engine cool completely before starting. Hot coolant can cause severe burns. If you've recently driven, wait several hours.
2. Drain the Coolant: Locate the drain plug on the radiator (usually at the bottom). Place your drain pan underneath and carefully remove the plug. Let the coolant drain completely.
3. Access the Thermostat Housing: The location of the thermostat housing varies slightly depending on the specific year and model. It's usually located on the top or side of the engine block, near the water pump. You may need to remove some components for better access (check your repair manual).
4. Remove the Thermostat Housing: Once you have access, carefully remove the bolts securing the thermostat housing. Be mindful of any fragile components. You'll likely need to disconnect hoses from the housing; note their positions for reassembly. Use pliers to loosen hose clamps if necessary.
5. Remove the Old Thermostat: The thermostat will be inside the housing. Carefully remove it. Inspect the gasket for damage; replace it if necessary.
6. Install the New Thermostat: Carefully install the new thermostat, ensuring the gasket is correctly seated. Make sure the thermostat's valve is facing the correct direction (usually towards the engine). Check your repair manual to verify the correct orientation.
7. Reassemble: Reinstall the thermostat housing, tightening the bolts to the manufacturer's specified torque. Reconnect the hoses.
8. Refill the Cooling System: Carefully refill the radiator with the correct type and amount of coolant. Refer to your owner's manual for the proper coolant mixture ratio (usually a 50/50 mix of coolant and distilled water).
9. Bleed the Air: After refilling, run the engine for a few minutes. Check for leaks. The cooling system often needs bleeding to remove air pockets. This usually involves opening a bleed valve (if your vehicle has one) or squeezing the upper radiator hose to help the air escape. Consult your owner's manual for the specific bleeding procedure.
10. Check Coolant Level: After running the engine, let it cool completely and check the coolant level. Top off as needed.
Important Considerations:
* Repair Manual: A factory service manual for your specific year and model of Pontiac is invaluable. It will show you exactly where the thermostat is located, what tools you need, and the correct torque specifications.
* Torque Specifications: Over-tightening can damage the thermostat housing or engine block. Under-tightening can lead to leaks. Always use a torque wrench to tighten bolts to the manufacturer's specified torque.
* Coolant Type: Use the correct type of coolant specified in your owner's manual. Using the wrong coolant can damage your engine.
This is a general guide. Improperly performing this repair can lead to engine damage. If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
