what causes a noise like the turn signal clicking but no lights are flashing on 2004 Oldsmobile Alero

A clicking like the turn signal clicking comes and goes at different frequencies but the lights don'e flash when this happens. The turn signals themselves work correctly. Any ideas?

Asked by for the 2004 Oldsmobile Alero
poss an a/c door actuator under dash. does it stop after approx 1 min after starting
it doesn't necessarily start right away and it comes and goes.