Ok, here's a new question that I couldn't find elsewhere.... Anyone else have issues with the A/C? On a hot day (over 90F) it blows decidedly less well when I'm on the highway and the engine is working compared to idle or lower speeds/downhill (it's really flat here in MN so not much of that).
The only time it's completely failed was on my first road trip in central WY. Rolling hills, moderate altitude (4000-5000), loaded for camping (rack on top but not towing), 65mph +/- and temps in the mid-90's. The only time the AC wasn't blowing warm air was on the downhills.
My dealer checked it out and found no issues. At no time has the temperature gauge budged from its normal state (needle is always vertical).
My thoughts are: A) the 3.5L is inadequate for this vehicle (as we know) and Toyota has tuned things on the conservative side with respect to the A/C's demands on the engine, B) there's a sensor whose calibration is off and causing the system to be abnormally conservative.
Any other ideas?