[mnm99]

Problem is I don't have a petcock. I cant see how I can control it by loosening the lower hose either. Do you think If I bought like a 4 ft hose and did what I said with the bypass it would work too? I quess the way I see it is the the pump will pump the new coolant into to motor then it will come out the bypass. Scroll down on this page and see what I mean

rear coolant passage

Originally Posted by Rick Parker

Remove the thermostat temporarily. If you have one, open the petcock on the bottom of the radiator or loosen the lower hose to allow coolant to drain in a controlled manner. While the engine is running fill slowly with a garden hose filling at about the same rate as what is draining out. Once clean water is flowing out turn off the hose, let the water drain completely and then fill with distilled water AND a coolant. If you can drain the block separately, do that before refilling.