Ready to beat GM manufacturers. Found out that there was a class action law suit against GM's dex-cool (coolant). Apparently the coolant acts like a detergant and strips the lines of the cooling system. Picked van up and drove about 25 miles and vehicle started running hot again!!!!!!!!!!!!!!!!!!!!! Then entire engine started shimming (as if it needed new plugs & wires) replaced those in Nov. of 07'.