Thread: Brown in radiator fluid

I looked in my radiator and I noticed brown heavier chunks inside. (The car still has orange dexcool also). To my knowledge, it could be stop leak? Buy either way I plan on doing a system flush and put unviversal Prestone in the system

Could be stop leak or the dexcool gelling up. Do a coolant flush.

when dex coolant has air in the system, it boogers up. like snot balls lol

flush the engine and rad, then add green coolant.

Flush that system like scotty said. DEX COOL has an organic compound that gets destroyed when tap water is added to it, basically ruining the coolant.