It's a 2001 chevy Venture Warner brothers van 3.4 I have sludge and slime on radiator cap (lots of it) and coolant return tank, so I want to flush it without diving under and getting plugs in the block out car has 250,000 miles. Do I want to use a flush or just plain water? I am figuring drain radiator remove t-stat and just flush away. I think the mechanic may may mixed dexicool with green. Any suggestions?
Thanks
logan