Yeah the fan runs with AC. Unfortunately when you’re towing and doing the long crawl the fans are already running. The front and back heaters blasting are the final effort to help shed heat . Did that going over Grants Pass OR in 100 degree weather. The good news is once at the top AC on full blast and lots of down hill cooled it right off. I suspect my faulty thermostat was just starting to affect cooling ability on that trip and by the end of the trip it was definitely an issue. But I wasn’t towing anymore after that so didn’t notice the increasing issue till it triggered a 230 coolant temp in 40 degree weather with just me in the car on the highway. It definitely has a progression of getting worse over time.