I've been driving the 97 C280 lately. The HVAC under dash / passenger side area has an air flap cycling noise when in ECON mode / 65* requested temp / 70* + outside temp. This noise is on a 3 to 5 second cycle like it is trying to regulate something but decides not to.

Would a leaking vac actuator pod do this? As in moves , leaks, moves back, controller responds to correct movement, cycle continues.

I have not yet looked at live data and there are no other odd behaviors.

Thanks