1992 Chevy Blazer fullsize
Out - rusty water, broken down ethylene glycol, silicate dropout
After a flush with Blue Devil “flush”, then 4lbs of citric acid followed by installing a flush tee and running the engine with the driver’s side block drain and radiator drain/fill neck open for 10 minutes with a hose running, 50/50 mix of Recochem generic green and distilled water.
O’Reilly sold us the wrong hose, so I’ll have to recheck the coolant concentration after replacing the hose. For some reason, I can’t get all the air out of the cooling system. But it bled fine during the 30 minute citric acid run.