Ok just checked, no matter what setting I put it on, the vents dont change. The only thing that changes is high/low/and auto air control, and when I push economy (EC) the compressor turns off. And the temperature of the air is as follows:

Drivers and passengers side - weak heat if heat is on, cool but not cold air if ac is on

Center front vent - pretty much no activity at all

Dash defrost output - medium airflow, again heat if heat is on, air is cool but not cold air if ac is on

Rear center vent - blows very hard, harder than any other vent, and the air temp does not change if heat/ac is selected. Always blows "room temperature" air.

Where could I get my freon checked? Can I do it myself or do I need to take it into a shop? If I have to go to a shop, does it have to be a mercedes dealership?

Thanks again, really wanna get this going before it gets too hot out