Lishap--Originally Posted by Lishap
Take a flashlight and shine it down into your radiator with the cap off. If your Dexcool was anything like mine, it's far worse than any flush can get out - you'd need to power wash that out. If it's caked in there, it will slowly corrode the aluminum radiator until it eats a few holes in it. No matter how many times I flushed, I kept getting mud at the radiator cap and the coolant slowly got discolored.
I ended up replacing the radiator. It isn't too bad to do - Pull the dogbones off, unhook and unbolt the fans, pull hoses and trans lines, a few more 10mm bolts, it comes right out. Guarantee if you took the rad apart there's more Dexsludge in there that a flush never got out. I recommend the 1" radiator from RockAuto for ~$100 as an upgrade from the stock 3/4".
That'll put an end to 95% of your sludge problem. There may be some residue left over in the block, but the block is iron, not aluminum - Dexsludge won't corrode that, AFAIK.
