Todd you are right. People aren't going to read instructions for something they've been doing all their lives, especially a simple task like this. Large bold letters across the top of the bottle of Dexcool that say "USE DISTILLED WATER ONLY" would probably have saved everyone, GM included, a lot of grief. But then if I read that on the bottle I'm probably buying the competitors product to save myself the trouble. GM was probably aware of that also.Dexcool is supposed to be used with distilled water. That was an error on GM's part thinking that people would actually follow directions. That being said, GM is known for leaky water pumps and intakes.
Same problems, '97 Z71, started leaking on it's own, back in '01, never added hose water.I have a 96 z-71 with a vortec 350, I never saw any kind of sticker anywhere about proper care concerning the coolant system. I added water to the radiator in small amounts over time....then everything started leaking. Intake, quick disconnect POS, radiator, water pump.....a mechanic told me it was due to air getting into the system that started the corrosion process.
We flushed the radiator on the truck and ran a hose through it for 30 minutes and the water never cleared up . It was unreal.