I used to work at an ac shop. The switch you are refering to is probably to turn the compressor on and off. the condensor is only for cooling like an intercooler or radiator and is not electrical. as far as the fan speed either the fan motor is going bad ie the noise you hear from the glovebox, it might also be the regulator i think that is what it is called it looks like a small cheese grader with a couple of wires to it it is located next to the fan under the dash both are inside the evap box under glove box. hopefully this helps.