Hi there, i am not sure is the sound come from ac compressor. So just a quick question here and appreciate your help.
Civic FD1.8 (2010). When i turn ON ac and when the ac clutch click the belt, i can hear some "knocking" noise at driver seat. The nouse is just like "tuk tuk tuk......". Then when accelerating, the sound's speed goes faster according to the rpm speed. Is it something wrong to the ac compressor part?

Fyi, the ac is still very cold whenever i turn on.

Hope you can help.

Thanks alot