randen
Thank you for the correction. I spend alot of time working on my car so I might have gotten the 2 year life of Propylene Glycol from automobiles.
I was thinking about SDMCF's post on the first page that said he installed his system in 2005 and had not replaced his Propylene Glycol since then and had a freezing event in his panels. I think that the fluid in his system is past it's prime. A replacement of the fluid should have him up and running like new since his system was not damaged.
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