Jim, thank you for the clarification. It makes sense now.

My car also stays below 90C on the highway. In stop and go traffic without A/C and roughly 95F ambient temperature, I have seen the auxiliary fans come on several times during the last 2 weeks or so. It looks like they engage at around 105-110C. It is a rare occurrence and the car cools down quickly with the fans on, but having them engage earlier will give me some extra peace of mind. CH-92 would be my choice as well.


Update from 8/26/07:

I installed the Cool Harness today, went with a CH-95 instead. It works flawlessly. Fans engage at 95C and go off at around 87C. This is awesome!