1. Check the Coolant Level: Before you start, ensure you have the correct mixture of coolant and distilled water (usually a 50/50 mix). Low coolant can lead to air pockets.
2. Locate the Radiator Cap and Reservoir: Identify both. The reservoir often has markings indicating minimum and maximum levels.
3. Filling the System:
* Remove the Radiator Cap: Carefully remove the radiator cap (when the engine is COLD!).
* Fill the Radiator: Pour in the coolant mixture until it's close to the top of the radiator. Don't overfill!
* Fill the Reservoir: Top off the reservoir to the maximum level.
4. Running the Engine:
* Start the Engine: Start the engine and let it run for about 10-15 minutes. Important: Keep an eye on the temperature gauge. Don't let it overheat!
* Monitor the Reservoir: Check the reservoir level periodically. Add more coolant if necessary to maintain the maximum level. You'll likely see bubbles as air is purged from the system.
* Increase Engine Speed: After a few minutes, gently increase the engine speed to around 1500-2000 RPM for a minute or two. This can help push air out of the system.
* Repeat: Turn off the engine, let it cool slightly, and re-check the coolant levels in both the radiator and the reservoir. Top off as needed. Repeat this process until there's no noticeable decrease in the coolant levels after running the engine.
5. Burping the System (If Necessary): Some 4.6L systems may require additional steps to fully remove trapped air. This often involves slightly tilting the vehicle forward to help air move towards the radiator. This is NOT recommended unless the above steps fail to completely remove all air.
6. Check for Leaks: After bleeding the system, thoroughly inspect all hoses and connections for any leaks.
7. Final Check: After the engine has cooled completely, check the coolant level in the reservoir again.
Important Considerations:
* Overheating: If the engine starts to overheat, immediately turn it off. Don't continue running the engine if the temperature gauge is high.
* Coolant Type: Use the correct type of coolant recommended for your vehicle. Mixing different types can lead to problems.
* Pressure: The cooling system is under pressure when the engine is running. Be extremely cautious when working with it. Always let the engine cool completely before removing the radiator cap or any other components.
* Professional Help: If you're unsure about any part of this process, it's best to have a qualified mechanic bleed the system.
Following these steps should effectively bleed the air from your 1996 Mercury Cougar's cooling system. Remember to always prioritize safety and consult your owner's manual for specific instructions.
