2002 cv clicking in or under dash

have a 2002 cvp71 it has a clicking noise either inside or under dash usually you hear it when you start it then goes away but sometimes reappears later .does anyone know what it could be or cause it ? Thanks

Possibly the Blend Door Actuator(?)

The lighting control module will also do random clicking. To test the blend door, move the temperature setting from cold to hot and see if it goes away and comes back when the door is moved all the way hot or cold.