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The vans with the 3.4L engine have a couple of bleed screws for the cooling system (see attached link for locations).
When the engine is cool, fill the cooling system at the radiator cap, with the bleed screws open slightly. When coolant starts to come out, close the screws quickly, to keep a minimum of air getting back into the system.
Once full, also fill the overflow tank to at least half full, then start the engine and allow it to come up to normal temperature. Then allow it to cool off again. Do this a few times over the next couple of days, and keep an eye on the overflow tank, always keeping it about half full. The action of the the overflow tank being emptied and refilled, as the coolant expands and contracts (with temperature changes) will also help to bleed ALL of the air out of the system.
Once the cooling system is full and has gone through a few cycles, then it should stay full and no more air should get into the system. If you find more air getting in, then you have other issues to look into.
Good Luck, Greg
Wiki User
∙ 14y ago
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