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Viano/Vito Owners - Is you aircon loud or noisy? (OM651 2.2)

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by MinionBob, Aug 1, 2020.

  1. MinionBob

    MinionBob Active Member

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    Your Mercedes:
    Viano - 2012 - OM651 Engine - 2.2
    The aircon on my Viano has a very noticeable burble/grumble to it. It is not a very loud noise but for some reason seems to be very penetrating; You seem to be able to hear it all the time, over everything.

    Before I start diagnosing, are other vans the same? Its more noticeable on the passenger side.

    It is there most of the time when the aircon is on, and is a deep grumble/burble/rumble noise. Unlike a bad bearing, the tone changes quite often.

    The aircon was regassed around 12 months ago (it was not in need of gas - done as part of routine) and made no difference to the noise.
     
  2. Kev555

    Kev555 Senior Member

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    Your Mercedes:
    2011 vito 113 CDI OM651 W639 panel van
    Never experienced an air con making noise unless the clutch on the air con pump or the pump itself. Is it cooling ok? Unless they over filled it ? Has it been making the noises since it was refilled?
     
  3. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
    UnMercs BMW i8 Volvo XC90
    Noisy when empty too..
     
  4. OP
    MinionBob

    MinionBob Active Member

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    Viano - 2012 - OM651 Engine - 2.2
    Hi Kev

    It cools just fine

    It made the grumbly noise before and after the regas with no change post-regas.

    Aircon systems are pretty simple really with few moving parts - I'm thinking its either the compressor or the expansion valve. I have a mechanics stethoscope on the way to see if it helps pinpoint the problem.
     
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  5. Kev555

    Kev555 Senior Member

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    Your Mercedes:
    2011 vito 113 CDI OM651 W639 panel van
    Aircon usually doesnt come on when gas is low John as a safety measure unless somebody has hot wired the solenoid or switch that keeps this from happening, possibly to re-gas it at some point
     
    John Laidlaw likes this.
  6. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Is it only on with the AC engaged (eg not related to interior fan speed?)

    Overcharged systems can make grumbling groaning noise.
     
  7. OP
    MinionBob

    MinionBob Active Member

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    Viano - 2012 - OM651 Engine - 2.2
    Yes, only when A/C turned on. Happens at any fan speed 1 to 4.

    I don't think it is overcharged as this happened before and after a routine de-gas and re-gas (and the guy who owned the van before me was not the sort of person to have a routine regas!)
     
  8. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Then check the pressures are in spec, potentially a compressor failure, or partially blocked system
     
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  9. OP
    MinionBob

    MinionBob Active Member

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    Your Mercedes:
    Viano - 2012 - OM651 Engine - 2.2
    Thanks - the pressure check is a good idea, blocked system also a possibility.
     
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