[ecraig8]

I just got a 2001 Carrera cab. I have question about a switch just below the AC contols, (lower left). It's two rotating knobs with a small light to the right. With the car running, turning the back knob counter clockwize, the light turns red, and I hear a chip, alobg with some red lights on the dash. Clockwize will trun the light green with a similar chip and red lights.

Any idea what this is for and what the switch does?


Thanks!