Coolant
Elder User
Joined: Mar 2017
Posts: 764
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I don't "flush" my coolant system. I prefer to do "partial exchange" every few years. A total flush is almost impossible to achieve; there's always some left in the system unless you drain the block by pulling the block plugs. Depending on how well one "flushes" the system, you can have an imbalance of the intended concentration % due to left-over volume in the block. Depending upon which coolant one has in their truck (orange is fairly common now; it's HOAT), it's important to get old stuff out and new stuff in every few years (2-3 years). I realize that some of these are "rated" at 5 year coolants, but I'd rather do a "partial" every few years. I just dump as much as I can get out of the rad and hoses, and refill. The upside to my technique is that I'm never out of balance on the % concentrate. Because I don't dilute the system with a flushing agent, I never have to worry about being out of balance. 50/50 is assured when you replace old with new, rather than flush.
Lead Driver
Joined: Feb 2005
Posts: 7,975
Likes: 2,670
From: The Great State of Texas
I don't "flush" my coolant system. I prefer to do "partial exchange" every few years. A total flush is almost impossible to achieve; there's always some left in the system unless you drain the block by pulling the block plugs. Depending on how well one "flushes" the system, you can have an imbalance of the intended concentration % due to left-over volume in the block. Depending upon which coolant one has in their truck (orange is fairly common now; it's HOAT), it's important to get old stuff out and new stuff in every few years (2-3 years). I realize that some of these are "rated" at 5 year coolants, but I'd rather do a "partial" every few years. I just dump as much as I can get out of the rad and hoses, and refill. The upside to my technique is that I'm never out of balance on the % concentrate. Because I don't dilute the system with a flushing agent, I never have to worry about being out of balance. 50/50 is assured when you replace old with new, rather than flush.
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powerstrokedieselfan
1994.5 - 1997 7.3L Power Stroke Diesel
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Dec 26, 2010 11:44 AM
