Flushing the radiator
1Park your Chevy Impala on a level surface. Wait for the radiator to cool down, then put on a pair of safety glasses and rubber gloves. You don't want used antifreeze to come into contact with your eyes or skin.
2Place a drain pan beneath the drain valve on the radiator. Any deep pan will work, whether it is an oil pan, a kitchen pan, or even a dishpan.
3Open the drain valve on the radiator and drain the used antifreeze coolant into the pan. While draining, open the hood of the Impala and remove the radiator cap by first pushing it down and then twisting it off.
4Allow the radiator to drain fully, then close the drain valve. Pour the used radiator fluid into a funnel that drains into a regular two-liter bottle. Fill the bottle with fluid and cover it tightly. This and all the other drained radiator fluids must be taken to an automotive shop or hardware store for recycling.
5Fill the radiator with water from a hose, then drain it again into the pan. Inspect the water for rust, sediment, dirt or debris. The drained water must be clear before you continue; continue to fill and drain until only clear water drains out.
6Mix up an approximate 50/50 solution of new antifreeze and water in a five-gallon bucket. Use a half gallon of antifreeze to start, and mix in the same amount of water. Place the funnel in the radiator and pour the mix into the funnel. Completely fill the radiator with the mixture.
7Start the engine and allow the radiator fluid to flow throughout the system. Run it for approximately 15 minutes, then shut it down and allow the engine to cool off. When the engine is cool, remove the radiator cover and top off both the radiator and the coolant overflow tank with the 50/50 mix.
Bleeding the air
With the engine running and the heater on high.
Open the bleeder valves on top of the t-stat housing and you might have one over on the heater by-pass pipe next to the passenger side motor mount, but I've seen a few cars without them so maybe you don't have one.. be very gentle, they're made of brass and twist off very easily.
Always bleed it with the car running. If normal bleeding is not getting the air out, use this method:
Raise front end about 8-10" off the ground so that the radiator and resevoir are higher than the heater core(remember, air rises to the top), fill resvoir and run engine for about 10 minutes with heater on high. Turn off engine, allow to cool for a couple of minutes and check resevoir. If below the full mark, repeat process. Do this until the resevoir stays at full mark(usually 2-3 times).
Here is a video I found, its low quality but.......
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