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Originally Posted by 300DPETE
When you finish the acid flush, and are ready to clean it out with water four or five times, how long do you need to run it on plain water each time (for each of the four or five times) before you fill up with 55/45 coolant? I was set to drive a few hours on the citric acid, but thought that after, all I had to do was run the car at operating temperature for 10 minutes or so for each of the 4-5 water flushes to get the acid out. Am I wrong?
Pete.
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It's just my opinion, but I would think that 10 minutes at full operating temperature would allow the water to mix with whatever remaining liquid is in the system.
BTW, you can become much more efficient with the flushes if you utilize the block plug. It's a PITA to get to, but the entire lower block, below the thermostat, is filled with coolant, even when you drain the radiator.