Jay, air can get trapped in a hose junction, the heaters as well as in the radiator. In very rare cases it can get trapped in the waterpump itself. The point here Jay is that when you empty and fill your cooling system you want to purge the system with one complete cycle of flow which passes through all the hoses and heaters and pipes. You need not get all of the air but just move enough to bleed out the trapped air. Small bubbles will bleed out over time. The only certain way to know this is accomplished is if the hoses up front get hot which is more important than the speed of the engine. --- Jay L Snyder <Jay.L.Snyder@usa.dupont.com> wrote: > > Heck, at this point (radiator hoses warm to the > touch), you could shut the > engine off and bleed it. There is plenty of > pressure to force the air out > of the top of the radiator--a lot more than you'd > get from revving the > water pump up to 3000 rpm! > >
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