It bleeds pretty easily. Fill the radiator with your 50-50 mix and start
the car. Wait for the fans to cycle on. Top off again and add to the
reservoir as necessary.
If your car begins to overheat, turn it off and let it cool. Add more
coolant as possible, and restart and wait yet again for the fans to cycle.
If you must add a lot more coolant, it's a good idea to let the fans cycle
These problems almost never happen unless the water pump is removed.