unkl300d, follow tbomachines' method for filling the radiator because that is the simplest way to avoid having air trapped inside. Best to remove the thermostat housing and thermostat and refill the block to just below the thermostat location to avoid having air trapped in the block. After the thermostat housing and upper radiator hose are reinstalled run the engine up to operating temperature and let it cool down. Add coolant as required to the expansion tank.

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Fred Hoelzle