Brief clicking from dash when I turn on the heat

What is your question?

My van has two sperate problems. 1 was the hear only worked on high. To fox this I replaced the a/c heat resistor under the hood on the driver side that goes through the firewall. The 2nd problem is the clicking under the dash when I torn the heat on. It only lasts a couple seconds then goes away. I think it's coming from the blend door actuator that's under the dash on the bottom of the blower motor. What's a fix for this? Do I have to replace the part?