Quote Originally Posted by dsmuts View Post
I pull the upper rad hose with the engine warm and the thermostat open and just run a garden hose in there until clear water comes out of the thermostat housing. Then drive it for a little bit and do it again. Then pull the lower hose and then refill with coolant.

doing this with the t stat out is much faster, only so much comes out when the t stat opens, when the cold hose water get to the t stat, it shuts again, so it s like 1/2 gallon spurts.