Engine Louder when air con off?

[Dipesh2031]

Hi,

bit confused by the gtd today which i didn't notice before, when the air con is off the engine makes a tapping noise like tappety but as soon as I turn the air con on, the engine becomes quieter and the noise is gone, just a slight hum of the air con compressor, anyone else noticed this, I know you all have GTI's but maybe you guys have noticed this?

Thanks

[Dipesh2031]

Bit of reading around, says the air con clutch? or aux belt, or the pulley itself, how much am I looking at? also what should I start with first?

[Mattyj]

Surely when you turn it on its more load on the engine so less noise

[Dipesh2031]

gonna claim that clutch is gone on warranty, probably have a new aircon compressor, and bye bye rattly noise, checked with other mk6's only mine makes this rattle noise, makes the engine sound unrefined