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How do you change a thermostat on 1975 corvette?

To change the thermostat on a 1975 Corvette, follow these steps:

Note: The steps will vary slightly based on the exact model and year of your car. It's always a good idea to consult the owner's manual for specific instructions.

1. Prepare the car. Allow the engine to cool down completely. Disconnect the battery to ensure safety and prevent any accidental sparks or electrical interference.

2. Locate the thermostat housing. The thermostat housing is typically situated on the front or side of the engine near the upper radiator hose. It's usually made of metal and might be covered with an insulating material.

3. Remove the upper radiator hose. Loosen the hose clamp and remove the upper radiator hose from the thermostat housing. This may involve using pliers or a wrench.

4. Remove the thermostat. Use a socket wrench to remove the bolts that hold the thermostat housing in place. Be careful not to drop any parts or spill coolant when doing so.

5. Clean the thermostat housing. Take the time to clean the thermostat housing to remove any rust, scale, or deposits. This will help ensure proper sealing when installing the new thermostat.

6. Install the new thermostat. Insert the new thermostat into the housing. Make sure it is positioned correctly, with the jiggle valve pointing upwards if applicable.

7. Replace the housing cover. Reattach the housing cover and tighten the bolts securely. Be careful not to overtighten.

8. Reattach the upper radiator hose. Put the upper radiator hose back onto the thermostat housing and secure it with the hose clamp.

9. Refill the coolant. Open the radiator cap and add a mixture of coolant and water to the radiator, as specified in the owner's manual.

10. Bleed the cooling system. If necessary, bleed the cooling system to ensure there is no air trapped. This may involve running the engine with the radiator cap off until it reaches operating temperature and the thermostat opens.

11. Close the radiator cap and check for leaks. Make sure all connections are tight and there are no leaks. If there are any, address them accordingly.

12. Reconnect the battery. Once you are satisfied that everything is in order, reconnect the battery.

13. Test the thermostat. Start the engine and let it run until the thermostat opens. This can be verified by observing the temperature gauge or feeling the upper radiator hose. As the thermostat opens, the hose should start to warm up.

Remember to follow any additional instructions or recommendations provided in your Corvette's owner's manual. If you are not confident or comfortable performing this task, it's best to seek the assistance of a qualified mechanic or car enthusiast who is familiar with classic vehicles.