I have a small trailer being pulled by a small SUV. You betcha that I never tow steep grades on hot days with the AC running. I need all the power I can get without causing over heating. AC units take power I do not want to waste. A struggling engine overheats. My vehicle has to last me a lot more years without major repairs! When I need to move to new campsites at a distance on hot days I hitch up the evening before and either travel at night or very early in the morning when I do not need to use AC. Running fan only without engaging to AC compressor is OK. But also think about getting a 12v fan you can set up to blow on you as you drive. Success in nomadic life is often about changing when and how you do things so that you can still get from point A to point B while doing no harm to yourself or your equipment. Getting up early and/or driving at night are not my favorite way to go from point A to Point B in summer but it works great and it keeps me out of the repair shop. So I have decided not to make a big deal out of it or whine about needing to do it but instead be very grateful for that option and still enjoy a journey that also means less traffic to deal with. When in deer country I prefer very early morning travel versus travel at night. At least you can see further ahead and to each side and have more reaction time.Illinois has tons of steep hills along the Mississippi, Rock and Illinois Rivers. Maybe the Ohio River, too. And, of course, Shawnee Forest area.
i've driven to Massachusetts many times through the Poconos and to San Diego and San Francisco. So I know what is considered steep.
Mostly I wanted to know if it helps my OLD truck to kill the air on steep hills.
You will have to be your own judge of are you working your engine too hard. Keep an eye on that temperature gauge, listen to your engine. Or avoid the worry and just change the time of day you drive so you do not need to run the AC compressor.
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