* Cooling System Leaks: Even a small leak can cause significant overheating. Inspect the entire cooling system meticulously for leaks:
* Radiator: Look for cracks, pinholes, or leaks at the seams. Pressure test the radiator to be sure.
* Hoses: Check all hoses for cracks, bulges, or leaks. Squeeze them gently to feel for softness or brittleness. Replace any suspect hoses.
* Water Pump: A failing water pump can't circulate coolant effectively. Look for leaks around the weep hole.
* Thermostat: A stuck closed thermostat will prevent coolant from circulating properly.
* Radiator Cap: A faulty cap won't maintain proper system pressure.
* Faulty Cooling Fan(s): The cooling fans are crucial for dissipating heat, especially at low speeds or idle. Ensure they turn on when the engine reaches operating temperature. Check the fan relays and the fan motor itself.
* Low Coolant Level: Even after a repair, the system could be low on coolant due to a leak (see above) or improper filling. Check the coolant level in the overflow tank when the engine is cold.
* Air in the Cooling System: Air pockets in the cooling system can impede coolant flow and cause overheating. The system needs to be properly bled after any repair work.
* Faulty Radiator Fan Clutch: If your Corvette has a viscous fan clutch, it might not be engaging properly. This requires more specialized testing.
* Clogged Radiator: Over time, the radiator fins can become clogged with debris, reducing its efficiency.
* Worn Thermostat: Even a new thermostat can be defective.
* Incorrectly Installed Head Gaskets (unlikely, but possible): Although unlikely if done by a professional, it's worth considering that the head gaskets might not have been installed correctly. This is a rare but serious possibility, which would lead to other symptoms besides overheating (potentially white smoke from the exhaust, milky oil, etc.).
What to do:
1. Check the coolant level: Make sure the system is full.
2. Visually inspect the entire cooling system: Look for leaks.
3. Check the radiator and cooling fan operation: Ensure they function correctly.
4. Bleed the cooling system: Get all the air out.
5. Have a mechanic perform a pressure test on the cooling system: This will pinpoint leaks that might be difficult to see.
If you've checked all these things and the problem persists, you'll need a qualified mechanic to diagnose the issue. Overheating can cause serious engine damage, so don't continue to drive the car until the problem is solved. Mention the recent head gasket replacement when you take it in.
