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I was asked to look at a Evac tube system today. 7 yrs old. Hot water tank temp is 62. appears to be no flow, pressure at 1 bar. Stebel eltron set up. Resol control. 120 gallon tank. I took a quick sample of the glycol and it was black. I presume it is baked.
What are the chances that the glycol ruined the collectors?
Can I flush it out w/ water on a cloudy day or at night and let it run w/ water until I can find some Tyfocor glycol?
Should I run some cleaner through it? If yes then what?