[oldstimer]

I researched a change from dexcool to green coolant in my 97 Suburban about three years ago. Water pump seal failure was a common complaint after the change over. Most believe that the dexcool goo that forms created a seal, and the green coolant washed it away. I changed to green coolant and swapped the water pump at the same time. Three years, no problems. Oh, I almost forgot, I also replaced the leaky intake manifold gasket at the same time.