My 1995 Mitsubishi Eclipse, and presumably other Mitsubishis of the same era, has a control over by the rear windshield wiper control, near the center vents. It's got 2 pictures of a person sitting. The bottom half of both pictures is black. The top image has the top portion in blue. The bottom image has the top portion in white. I presume it has something to do with the vent/hvac control system, but I don't know what. I've tried flipping it between the 2 positions numerous times, but can't tell a difference in anything. What does this mystery control do!?