Thread: Coolant sludging after 2 flushes

Hey thanks for replying...so I should pull tstat for this type of flush? Adding just water with a cleaner and running the drain? Or do you mean pull tstat when doing the garden hose type flush?

Hey guys so I ended up doing a couple flushes yesterday, pulled the tstat and used distilled water with a flush treatment. Was working my 3rd one just now and all the sudden after idling / small drive for like 10 minutes and turning car off, I heard some horrid noise and my reservoir started overflowing like crazy. I didn't overheat and never have so I'm worried about this. Any ideas here? Is this a head gasket fail? Or a clog somewhere?