Cleaning DexCool "gunk" out of your overflow tank
I just swapped out my DexCool for Prestone on my 98 LeSabre. As I have seen on many of these cars, the inside of the plastic overflow tank was coated in some kind of rusty-looking gunk leftover from the DexCool.
I wanted to get that junk out of there, so I removed the tank for cleaning. Lacking a bendable bottle brush to scrub that crap out, I tried "swishing" all kinds of cleaning solutions in the tank: Simple Green, vinegar, bleach, baking soda, ammonia, rust remover, mineral spirits, carb cleaner...none of that worked. Someone in another post mentioned brake cleaner, but I didn't have any on hand.
Finally I tried a concentrated solution of Oxi-Clean...the gunk disappeared almost instantly.
Just a tip for any who don't like gunked-up overflow tanks.
2004 Buick Lesabre Limited, Gran Touring; Bone Stock
1998 Buick Lesabre Limited, Gran Touring; Mods: Poly sway bushings/endlinks, Tru-Cool trans cooler, Thrasher shift kit (med), PLIM, front PEM; Mods in progress: Alot of stuff, but slowly...