Question about 2005 Mercedes-Benz Sprinter 311CDI

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Air-con faulty air-con led on-no cooling, compressor not activating, condenser fan not working, have haynes manual, but wiring colours and numbers dont match book. various voltages at 21 wire multipin on back of fascia, but nothing changes when operating air-con & speed switches. any ideas or a correct wiring diagram?

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  • Mercedes-Benz Master
  • 880 Answers

Sounds like an electrical problem check all fuses and ac clutch relay

Posted on Jul 20, 2013

  • muttley Jul 20, 2013

    thanx stuart, 30a fuse blew when condensor fan siezed, replaced both already, swapped air-con and horn relays to prove both are good, no change in volage of any wires on back of dash console when switching a/c on and off. haynes manual wiring colours and connections do not match-up with actual ones on van and still need a good wiring diagram? HHEELLPP!



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Your library may have the diagram. Does any speed work? If it runs on full, there is a resistor pack in the fan housing that can be changed. This unit may also have multiple fuses controlling it. Merc has a habit of building the most difficult cars in the world to trouble shoot. Good luck, sir.

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SOURCE: Condenser Fan not working when the Air Cond is On.

There is a high pressure switch on the high side of the ac system,it most likely is bad.

Posted on Apr 06, 2010

Testimonial: "I had change the pressure switch but the problem still same"

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Hello Tony! What year is your 560SI? Guru....saailer

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