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Old 02-14-2017, 07:49 AM   #3
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,279
Short of standing the car on end and shaking it a couple of times, you are not going to get all the coolant out. The best you are going to get doing a gravity drain is around 80-85% of the system's capacity. Refilling the car with distilled water, then running it for a bit before draining will help get rid of any remaining old coolant.
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