Auto Air Conditioning & Heater Repair: mercedes 2002 sprinter air con, auto electrician, air temp

Question
Have no power to the  compressor when turned on, won't cut in . Auto electrician can't find the position of the relay to trace the wiring .Maybe you can help. Thanks

Answer
HI Bob

Sorry Bob not to much information on Mercedes products available to the aftermarket.  Make sure you have enough refrigerant in system to make it run.  See if you have power getting to the clutch.  I have seen some problems with the ambient air temp. and evporator air temp sensors.