well the rear fan works fine, blows pretty strong on "3". Yesterday, I actually sat in the back and adjusted the rear controls, with the driver control on "R". I have the digital display, so I could see where the rear A/C temp was set all the way to "C" and I turned the fan control all they way up. I did feel a but colder, but then the truck was just sitting at idle, so I still could not get the full effect. Maybe next time I have some passengers back there, I can get better feedback.
2003 Chevy Trailblazer LT EXT
1971 Chevy Chevelle
The ignition switch holds WAY TOO MUCH POWER in these vehicles!!