What was found
WHILE ENROUTE TO LAX, SMELLED AND NOTICED SMOKE COMING FROM THE FRONT OF THE DASHBOARD, WE DID INHALE SMOKE. ANNOUNCED SMOKE IN THE COCKPIT. WE BEGAN RUNNING ELECTRICAL FIRE CHECKLIST BECAUSE DID NOT HAVE AN ENGINE FIRE CAS. HEARD A SOUND COMING FROM THE FRONT OF THE AIRPLANE WHICH SOUNDED LIKE A BELT SLAPPING THINGS IN THE COWLING. TURNED OFF THE AC AND THE SOUND AND SMOKE STOPPED. WE ALERTED ATC IN WHICH THEY DECLARED AN EMERGENCY FOR US. CONTINUED TO LAX WHERE WE MADE AN UNEVENTFUL LANDING. ARFF AND AIRPORT OPS FOLLOWED US FROM THE RUNWAY TO OUR C5 PARKING SPOT.