John,
I was thinking about this subject too - so many of Whirlpool's machines now are ATC-auto temperature control, maybe even all of them. Some of the current line started with standard mixing valves and they've now been slightly modified (with one of those engineering changes we've mentioned) to have a valve on either side of the fill-flume, one is blue and one is red. They appear about 6-8 inches apart on the back of the machine. I'd like to use a belt drive 358277 valve but I don't know now without knocking a hole in the rear panel, that one could be mounted. I did wonder however about using two separate single-solenoid valves and connecting them together on a T.
I think the best advice above may be to just get used to lower temps. The funny part is that with my belt drives and the absolutely frigid tap water we have in Charlotte right now, if I don't add a lot of hot to a machine, especially to those in the garage where it was only in the 50s this weekend, 'warm' is barely cool in my description. Contrast that to summer when warm, especially if I've used some hot water recently (finicky newer gas water heater) is almost too hot as our tap water could pass for luke-warm. It would be perfect for Cold-water Tide, no doubt. Maybe something that keeps these temps. better moderated isn't a bad thing?
Gordon