Let the engine cool for 20, repeat the process as the water in the funnel miss with the rest of the coolant and will look like this. After refilling and running engine hot and thermostat open, I am letting it cool overnight. Tomorrow will repeat process until it comes out clean. I didn't want to open engine cock, with my luck I will strip the bolt and will need big repairs. So flush it is, going to need more buckets.
I guess no matter what you do, some tap water will remain in the system? Will flush with distilled water at the end, realizing that one gallon will remain in system
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