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There is only one on the radiator, but this is what i did.
Drain the radiator, then remove the thermostat. Put a water hose in the hole where the stat was. Then let it run until the water coming out of the radiator is clear.
I was just thinking there might be more sediment the further down I drained it, but I guess if I flush it, all the sediment will come out anyways. Oh, and I dont really know how much water is in the system compared to coolant, so I thought I'd drain it all, then just fill it up with the right mixture. But I'll just fill it up with 50-50 mixutre and it should be fine.
Yeah, the zerex flush kits o a pretty good job for that, but you still wont get it all out. To take the thermostat housing off is only 3 bolts (although they are a pain to get to. I took off my intake to make it easier). Then open the drain on the radiator and put the water hose right in the block. It worked great for me. You might want to get a new stat and seal while you are there, but they are less than 10 dollars.