There have been design issues with the GM motors, not fluid issues. If it came with dexcool, I keep it that way and have had no ill effects. The one exception that" MAY" be contreived that way is the 3.8 intake manifold that is plastic. Due to poor design and heat issues the DEXCOOL will eat away the plastic. But no more than the old standard Green coolant would do.
Good to hear you got it fixed though, please use 2CarPros anytime we are here to help.
Wednesday, August 22nd, 2007 AT 7:13 PM