I have a 99 K1500 Suburban with a 5.7L(350). With all I have been hearing (bad) about the Dexcool, I have decided to flush it out and put the "Ol-Green" stuff in. Since freezing season is over, I was considering draining the cooling system, filling it with water only and driving for a week and repeating this about 3 or 4 times to get all the dex-cool out. Is this a good or bad idea? I just have my doubts that a single drain would completely drain the system on the suburban, since the hoses go to the rear heat.
Brian