It clicks like every 3 or 4 seconds when the floor/def or regular def is on. It happens even when the fan is not on. Thinking that it is not the fan for that reason.
If it is doing it with the fan switch selector off...then it wouldn't be the blower as it is off.
There are relays a resistors behind the glove box location. Have you pulled the glove box off and tried to pinpoint a closer location of the issue?
If it only makes the sound as you put the fan location selector to defrost or the floor...I would have to say you hear the blend door moving into it's posistion for that setting.
Can you make a video of the issue sir?
If you can, please leave the engine off so to better hear please.
:wavey: