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What part is this? a6 tdi 3.0 quattro

Audia6tdiquattro Oct 29, 2018

  1. Audia6tdiquattro

    Audia6tdiquattro New Member

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    Hi

    Heard a pulsating sound coming from engine bay when ignition is on and also when engine is on - pulsating continues when engine off - took off cover and the pulsating is coming from the two grey cylindrical things in my picture - any idea what they are please?
     

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  3. zit501

    zit501 New Member

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    I believe it's the coolant valves for the HVAC system. They do go faulty and aren't too difficult to replace. There's also a video on youtube of a guy cleaning the valve plugs on one to get it working again, which can be done without removing the entire valve body:

     
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