Coolant/oil heat exchangers
Hey folks! I've been battling overheating issues with my Rotax 914 Rans S-19 in Phoenix, AZ when OAT is 85F+. During initial climb out, I can see upwards of 255F on coolant and 265F CHT (245F/255F if I'm careful about leveling out and step climbing). Cruise is fine, but still more toasty than I'd like: 220F on coolant and 240F CHT. Ground is also fine. Other temperatures appear to be fine as well.
It's the old style cylinder heads, but there's a coolant probe installed on a part of the tubing.
The original owner/builder looks to have installed a coolant/oil heat exchanger from mocal in addition to the flat radiators for coolant and oil. I've never used a heat exchanger since I've been mainly in warm climates, but does that stick out to anyone here as problematic for hot climates?