In first photo that dimmer like thing is a desi jugaar done by mechanic's to trip the AC at a certain vent temperature (serving as a thermostat) bypassing the original AC module in the car.
The lever in 2nd photo is used to change the direction of air flow towards floor, windshield, or front vents.
Also these serve to select hot and cold air there would be 2 or 3 same kind of levers on this HVAC unit.