Winston, there was a long thread here about the cooling system on my tractor a couple of years back. If I just had a warning light on it, I probably wouldn't think there is a problem, as it has never overheated. I have taken extensive temp readings with a laser at different points on the tractor, and the guy at Fredrickson said it was ok. Some folks here disagree, but I decided that I am just gonna run it. Everything related to the cooling system was replaced; I don't know anything else I could do.
And yes, the time it gets hotter than I like is when cutting tall and tough grass on 100 degree days in August. It's hard work for such a small tractor.
Sounds like you are on top of it. :thumbsup: