1. Gather the necessary tools and materials:
- New thermostat (OEM or compatible aftermarket replacement)
- New thermostat gasket (if not included with the thermostat)
- 5/8-inch (16mm) socket or wrench
- Flat-head screwdriver
- Pliers
- Funnel
- Coolant (premixed or concentrate, as specified in your owner's manual)
2. Allow the engine to cool down completely before beginning the repair.
3. Locate the thermostat housing. In the 1997 Chevy Cavalier, it's usually situated near the top of the engine, close to the radiator hose connection.
4. Place a drain pan or container underneath the thermostat housing to catch any coolant that spills during the replacement process.
5. Disconnect the upper radiator hose from the thermostat housing. Use a flat-head screwdriver or pliers to loosen the hose clamp and pull the hose off.
6. Remove the old thermostat. Use the 5/8-inch (16mm) socket or wrench to remove the bolts that hold the thermostat in place. Carefully remove the thermostat and the old gasket from the housing.
7. Clean the thermostat housing. Use a rag or a wire brush to remove any dirt or debris from the housing. Ensure the sealing surface is clean and smooth.
8. Install the new thermostat. Place the new thermostat in the housing, ensuring the correct orientation. Install the new thermostat gasket if it's not already present on the thermostat.
9. Reinstall the bolts and tighten them securely with the 5/8-inch (16mm) socket or wrench.
10. Reconnect the upper radiator hose to the thermostat housing. Tighten the hose clamp securely.
11. Fill the coolant reservoir with the recommended type and amount of coolant. Use a funnel to avoid spills.
12. Start the engine and let it run for a few minutes. Check for leaks around the thermostat housing and the radiator hose connection.
13. Once the engine reaches its normal operating temperature, turn the heater on high and check the flow of warm air from the vents. This ensures that the thermostat is functioning correctly.
Remember to properly dispose of the old thermostat, coolant, and any other waste materials generated during the repair. Additionally, refer to your vehicle's specific service manual or a reliable repair guide for detailed instructions and specifications related to your specific model and year.
