My car runs well, and AC is very good.

I noticed that the AC's condensing unit has an electric cooling fan which which can run at low or high speed, due to presence of a resistor. However, I've seen it running only at one speed.

I'd like to basicaly know when and what activates the fan to run either at low or high speed.

Thanks a lot to all you guys.

The fan runs on low speed when activated by the A/C high pressure switch located on the drier. The high speed will come on in the event of an overheat situation triggered by a switch on the cylinder head.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM