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Mercedes Vito W639 - The air-conditioning compressor does not turn on, factor ok

viper111 38367 7
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 16404301
    viper111
    Level 13  
    Posts: 649
    Rate: 386
    There is no air conditioning compressor in the Vito Mercedes. I noticed it until after winter.
    I unscrew the nut from filling the fan and after pressing the valve hisses, the system has pressure (although I have not yet checked what).
    No less because there is pressure and the climate completely does not give a cold and I do not hear that the compressor turns on, I suspect that the problem may be with the module.
    On the web I read that it is often the air conditioning module that falls (cold February). Question: where will I locate this module, or in the fuse box under the hood? And which one would it be? Can not find a pattern anywhere?

    Mercedes Vito W639 - The air-conditioning compressor does not turn on, factor ok Mercedes Vito W639 - The air-conditioning compressor does not turn on, factor ok Mercedes Vito W639 - The air-conditioning compressor does not turn on, factor ok Mercedes Vito W639 - The air-conditioning compressor does not turn on, factor ok Mercedes Vito W639 - The air-conditioning compressor does not turn on, factor ok
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  • Helpful post
    #2 16404356
    andrzej20001
    Level 43  
    Posts: 17695
    Help: 1568
    Rate: 6610
    viper111 wrote:
    after pressing the valve hisses

    As he has 0.5 bar, he also hisses. Measurements, above all.
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  • #3 16404359
    viper111
    Level 13  
    Posts: 649
    Rate: 386
    And what should be the nominal pressure?
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  • #4 16404474
    nici
    VIP Meritorious for electroda.pl
    Posts: 4961
    Help: 266
    Rate: 977
    About 3-4 bars, depending on the temperature.
  • Helpful post
    #5 16404850
    decybel91
    Level 43  
    Posts: 7987
    Help: 1020
    Rate: 4191
    The most common are the cables at the compressor plug and / or the temperature sensor. Failures of the compressor itself also happen.
    At 0.5bar it will also start, but there will be no cooling.
  • #6 16406965
    Gerri
    Mercedes specialist
    Posts: 5662
    Help: 853
    Rate: 3596
    viper111 wrote:
    I do not hear the compressor turn on

    You will not hear because it is a variable performance compressor. There is no electromagnetic clutch.
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  • #7 16409237
    Aleksander_01
    Level 43  
    Posts: 12626
    Help: 1150
    Rate: 3351
    I will tread on the subject, and where this air conditioning module is located. For me, the air-conditioning is on but it does not turn the fans on the radiator, the relays are functional.
  • #8 16420482
    viper111
    Level 13  
    Posts: 649
    Rate: 386
    In fact, the lack of refrigerant, proven leak tightness and minimal leaks :( The system sealed with an addition, we'll see how much it will last.

Topic summary

✨ The discussion revolves around a Mercedes Vito W639 experiencing issues with its air-conditioning compressor, which does not activate despite the system having pressure. Users suggest that the compressor may not be functioning due to low refrigerant levels or potential faults in the compressor's wiring or temperature sensor. The nominal pressure for the system should be around 3-4 bars, and it is noted that the Vito uses a variable performance compressor without an electromagnetic clutch, which may explain the lack of audible engagement. The location of the air-conditioning module is queried, with indications that it may not be in the fuse box under the hood. The author later confirms a refrigerant leak, leading to a temporary seal with an additive.
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