On warm rinses...
I grew up with the 1961 Kenmore 70, which also had the same five independent temperature combinations as this 1965 800. I don't recall my Mom ever using a warm rinse, not on that machine, or the next two either. I can't say why, but maybe she was on to something back then, because we certainly haven't suffered from poorly rinsed items for 52 years.
When it came time to buy my own Kenmore, the specific model that I could afford (on sale) has no warm rinse option, and I've never missed them. About the only time I like a warm rinse option is for the spray rinses when I want some extra water volume splashing through the spin sprays.
Today, as I use a number of other machines, many of which have a warm rinse option, I never use it. I would imagine over the years that's saved a number of therms on the water heaters! Sears has put in print many times on washer operating manuals and on sales literature that cold water rinsing had been tested and shown to be "virtually as effective as warm water rinsing".
Gordon