Clunking/Knocking when AC turned on

[jackdog1]

I recently recharged the AC in my parent's 04 Civic LX using an AC pro kit, and now the air is ice-cold as it should be, but they've noticed a non-rythmic clunking/knocking noise from the lower middle of the front of the car (sounds like it's just behind the console) when the AC is turned on (only during driving, nothing during idle). The sway bar looks like it's in good condition, the front torque mount in new, the upper driver's side engine mount is new, the other mounts look good, and I didn't notice any buzzing from the compressor

 

[David C.]

Could be a motor mount going bad. Check them for cracks.

 

[Diana Nam]

i would go recheck the rear mount, that rear mount sits in pretty muchright behind your center console sit just on the other side of the firewall of course. Try do a power brake test with the hood open and check to see if the rear of the motor is moving up and down to much or makes that clunking noise. i've seen mount that physically looked 100% spot on but in actuality the rubber its self was no good.