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Coolant Flush and Antifreeze Question

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Old 01-09-2018, 03:02 PM
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Originally Posted by 300sflyer View Post
Here's what I did:

Drain the old antifreeze into an empty container"s". Refill with your garden hose. Take it for a 20 min drive. Drain again, then refill one more time with the garden hose, then another 20 min drive. Drain for the last time, and refill with a 50/50 mix of Prestone and distilled water. Most local garages will accept your used antifreeze for proper disposal.

Goes without saying you do not want to do this in sub freezing temps! About zero F here this morning! LOL!
If you do it this way, you're overall final mixture is going to be LESS than 50/50 -- because draining the system does not get all of the water out of the block.

I did what you describe here, but I included 3 additional fills/flushes with distilled water. And at the end of all that, I then added enough fully concentrated coolant (and NOT the 50/50 pre-diluted stuff) such that, in the end, my final mixture is correct.

I did mine in the summer. And I remember it not being fun -- due to the 100'F temps at the time. Doing it this time of year would be even less enjoyable.
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