AC makes knocking noise also causes motor to vibrate when driving/revving

[OneManDeep]

ac runs pretty cold, but it makes a noise like its rocking back and forth as the blelt turns it pully. It also causes the engine to bogg slightly

[driftnoob333]

well i think ur pump is stuck or siezed take the belt off and see wat happen

[240sx with rb26=BEAST!!!!]

well i think ur pump is stuck or siezed take the belt off and see wat happen
He said his a/c still gets cold therefore the compressor isn't seized or stuck but its starting to.

[Chaluska]

it could be the Auxiliary air control.. (mounted by the IAC).. it lets in a bit more air when the a/c kicks on.. does your idle raise

[OneManDeep]

yes, idle does increase slightly. if the aac is the problem, would it only make noise when the air is actually running? And what exactly would indicate it as the cause?