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A customer's complaint made me rethink my coolant flush method
A guy came back after a week saying his truck was overheating again. He said, 'You just dumped the old stuff and poured new in, didn't you?' I used to do a quick drain and fill, but he was right. Now I run a chemical flush for 20 minutes, then use my machine to push three full gallons of distilled water through the system before adding the fresh coolant. His comment saved me from a comeback. Anyone have a different flush routine they swear by?
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nguyen.tara6mo ago
Actually, you might want to skip the chemical flush unless there's heavy scale. A lot of times just the machine flush with water is enough and it's less harsh on old seals.
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lewis.troy6mo ago
But what about the gunk you can't see? Water alone won't touch the built up sludge in the lines. Old seals are a worry, but so is low flow from blocked pipes. A mild acid flush done right is safe. It's about picking the right cleaner for the system's age. Skipping it can leave problems that just get worse.
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noah9996mo ago
My old house had a 25 year old boiler. I used a citric acid flush at half strength, ran it for only 20 minutes, and it cleared a lot of sediment without any leaks. The key is a very short contact time on older systems.
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