pedal/air conditioner issue
 

hey everyone. i have a 2007 h3 and have recently started having a problem. when driving, i dont hear or feel anything in the pedals until a turn the air conditioner on. once I turn the air on, i begin to hear a clunking sound from the pedals and a vibration in them as well. has anyone else ran into this or know what could be causing it? when the air isnt being used its not a problem. ..