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To bleed the cooling system on a 2003 GMC Savana van, first ensure the engine is cool and remove the radiator cap. Start the engine and let it reach operating temperature while keeping the heater on high. This allows any trapped air to escape; you may need to add coolant as it lowers. After the thermostat opens and air bubbles dissipate, turn off the engine, allow it to cool, and check the coolant level again, topping off if necessary.

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