Joe, I had the same start problem you had, and a new accumulator solved the problem. The air bleed screw is located on the top of the water pump. It is a small screw that faces towrd the rear of the car. It isn't the easiest part to get to when you have to bleed the system. I wouldn't think you'd have to bleed the system just because you added some coolant. I've had to add coolant before and never had any problems, so I never bled the system. Brian VIN 1597