Thanks for the replies. We bought the Outlander at the end of January, second hand from a Honda dealer, 32,000 on the meter. (We were in a bit of a hurry because our 2006 Forester blew an engine and repair costs would have been higher than the car was worth.) Anyway, we have taken the Outlander over the Coq & Connector a couple of times since then, including one trip in August. In September we took it up Mt. Revelstoke as far as the road allowed. Having driven manual transmissions for most of my life I am inclined to downshift when going up or down steep hills. So, with the Outlander I move the CVT control from D to Ds which appears to be equivalent to shifting a manual from 5th to 4th; engine revs go up.
Last week, we drove up to Mt. Baldy ski area which is a steep climb, 10% in places according to the sign. The car behaved perfectly doing that. Afterward, there is a long trek home without much stress on the drive train. It wasn't until we passed Penticton that the car went into limp mode. I would have expected it to cool down by then.
I know nothing about CVTs other than they look like they belong in snowmobiles. I don't know why they have transmission fluid, what kind of fluid it is, why it would overheat, whether there is a filter, etc. I don't know how often the CVT fluid should be replaced. More importantly, I don't know whether the CVT has ever been serviced although total KM so far is only a few over 40,000 which doesn't seem like much for a transmission.