adamsanders
Full Access Member
I have a question regarding a coolant flush/change I am in the middle of. So my coolant was very nasty when I drained it. Unfortunately I didn't measure how much came out originally but I assumed I would get 7-8 gallons (using block drains+radiator drain) as I have read on OB many times. I have flushed about 5 times now and started roughly measuring the amount of water I was draining each time (using block drains + radiator drain) and it is only about 4-5 gallons. I am catching at least 80-90% of the water and I am letting it drain until its just a drip. What could be causing such a low capacity? To flush, I am filling the radiator, running the truck to operating temp., and then draining it. Also, the water started getting quite a bit more clear after all the flushes.