humming noise

[khalil]

hi all, wondering if someone could tell me if this is normal on a audi a3 2.0tdi 2004,
when i have the climate control on, really low setting i hear a humming noise when the car is idle, if a rev it a little it goes away,
just wondering if this is normal, maybe the noise is still there if the setting is on full but you cant hear it i guess with the all that air its pushing out,
the heat/cold air everything seems ok,
whats your thoughts?

 

[drewbee]

i just had my aircon regassed and i have the same problem.

only when i turn off the econ button the humming starts.

shall i be worried and called the compnay up who regassed the system?

 

[Staz]

It all depends on where the humming comes from. With the air con on there is an extra fan running and a belt driving a compressor, they're sources of noise of course. You'd be better off asking people who have cars of the same age and type in the relevant forums.

 

[A4_MaJiK]

i just had my aircon regassed and i have the same problem.

only when i turn off the econ button the humming starts.

shall i be worried and called the compnay up who regassed the system?

x2 on this. Seems as though the humming is coming from the condenser fan.

Azeem