I went out in this heat wave today to get a few things. When I left the house, it wasn't too bad, but in the timespan of an hour it got muggy. Muggy enough that I kicked on the AC. First time this year. In my 95 Grand Prix.
Anyway, it wasn't working that well, and I though I was going to have to get a can of dye and start checking for leaks. Then I realized my temperature control wasn't solid off. As you turn it hot to cold, at the very coldest there's a detent that feels like it's activating a switch. Once I set it there, cold air flooded the car.
I'm pretty sure the AC was working even when the temp wasn't full cold, as it was making the car comfortable and it was obviously drying it out.
But my question is, what is that switch/detent for in the control? MAYBE it was just that I wasn't full cold and it was 'mixing' hot and cold like on rainy fall days when you run the AC more as a dehumidifier, but it sure felt like a massive change when I moved it today.