Flatjack9–so switching to all water cured the foaming issue?
Problem looks to be solved!!Problem looks to be solved!!
Installed 160 thermostats and Skip’s overflow check valve…and after a 10 mile trip with temp running around 160-165, pulled into driveway and parked it….and zero overflow!!
Will continue monitoring but so far so good.
Thanks to everyone who responded, and also to Tom Roche who provided guidance.