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Drain Coolant

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1. The first step to installing the new radiator is to get the old one out of the way. First, drain the coolant using the petcock or plug on the bottom of the radiator and then remove the upper and lower radiator hoses. If your rig has an automatic transmission, chances are the radiator also cools the transmission fluid. This means there's inlet and outlet lines running to the radiator that must be removed (inlet line shown).