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Volkswagen Golf Mk7 Service & Repair Manual: Ultrasonic air conditioner cleaning unit -VAS 6189A

The ultrasonic cleaning unit -VAS 6189A-, placed in the front passenger footwell, sprays Aero-Clean to neutralise microbes and bacteria throughout the Volkswagen Golf Mk7 heater/AC system.

The ultrasonic air conditioner cleaning unit -VAS 6189A- must be placed in the front-passenger footwell and sprays the agent Aero-Clean. Aero-Clean neutralises microbes and bacteria in the heater and air conditioner unit.
The device is provided with instructions for use.
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    Questions & answers

    Ultrasonic air conditioner cleaning unit -VAS 6189A — Volkswagen Golf Mk7

    How does the Golf Mk7 ultrasonic AC cleaner -VAS 6189A- work?
    Place the unit in the passenger footwell. It nebulises a biocide solution which penetrates the evaporator, killing bacteria and mould.
    Is the smell coming from evaporator or the heat exchanger?
    Fishy smell –  Due to leak in engine's cooling system or in heat exchanger of heater and air conditioner unit.   N ...

    Spraying the evaporator with the suction feed spray-gun -V.A.G 1538- and spray lance
    Spray the evaporator with Contra Sept directly using a spray lance (approx. 10 bar). Contra Sept neutralises microbes and bacteria directly at the evaporator. ...