Re: water temp fluctuates
Everything is in good "order". Coolant level and look is fine. What I really need is 2 or 3 hemi owners to cruise on the hwy and watch the coolant temp and see if it oscillates from 197-222F or so, especially at about 30F ambient, like constantly, and at least once a minute. I suspect in order of my own opinion of likeliness:
normal function - or within normal function.
Failing or malfunctioning fan - turning on at 220 as expected, then maybe overcooling and shutting off completely?? Not sure how these work, really..
failing t stat (although on all the sites I've searched people with similar problems with other types of cars had no effect from new t stats!)
Failing water pump - as these fail a lot but mine is nearly new, and isn;t leaking or making noise. Could be faulty replacement as I think it is happening since replacement, but not sure how a water pump could cause this.
air bubble - I've "burped" it without effect, and it's been doing it for over 500 miles.. Seems unlikely.
Oil temp never varies and is always fine at about 190F while this happens.
I'm not planning hwy travel for a while, so I am going to watch it in city driving for a while as it seems fine there...