Here's why you might still have a leak even after the timing cover gasket was replaced:
* Multiple Leaks: A 99 Chevy Malibu is relatively old. It's common for multiple seals and gaskets to fail simultaneously, especially coolant system components. Other potential sources of coolant leaks include:
* Water pump gasket: This is a very common leak point.
* Radiator: Cracks or leaks in the radiator itself.
* Heater core: Leaks inside the cabin (often noticed by a sweet smell or wet carpet).
* Coolant hoses: Cracks or deterioration in the hoses.
* Thermostat housing gasket:
* Cylinder head gasket: This is a serious issue, often resulting in coolant mixing with engine oil.
* Improper Repair: The mechanic might not have done the repair correctly. Perhaps they didn't clean the surfaces properly before installing the new gasket, leading to a poor seal.
* Underlying Issue: The leak could be caused by a warped or cracked timing cover, which wouldn't be fixed by simply replacing the gasket.
What you should do:
1. Go back to the garage: Explain the situation. Ask them to thoroughly inspect the entire coolant system for other leaks. Request a detailed explanation of the repair they performed, including photos if possible.
2. Get a second opinion: Take your car to a different reputable mechanic for a diagnosis. This will give you an independent assessment of the problem and its cause.
3. Inspect yourself (if you're comfortable): Carefully examine the engine bay after it's cooled down. Look for wet spots, traces of coolant, and any obvious damage to hoses or components.
Don't pay for any further repairs until you're confident you understand the problem and the proposed solution. A persistent coolant leak can cause serious engine damage if left unresolved.
