Driving my 2007 gas Safari Simba 8.1 GM engine south on 287 in Wyoming today. Rolling hills,nothing major. Temperature in low 80's,I was towing my Jeep Sahara. As it warmed, I turned on the dash air. ...
I have had my A/C on going in and out of all the grades in Calif. and never has it effected my engine temperature. I think I would keep looking for the culprit. Just my 2c.