Quote:
Originally Posted by eurogreek1
What does a vent actuator do? Is it right next to the blower motor? Reason why I'm asking is because I was having issues with both the heater/AC as far as air flow goes. Mostly the center vents. It always sounded like a flap would shift prior to loosing air regardless of fan speed. I did change out both the blower motor/controller and still the problem is there. I also saw this gray looking box next to the blower motor which I think is the vent actuator. Can this be the problem? Where is it located?
Thanks
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Hmmm, since no e70 owners has chimed in yet...the "actuators" used in the HVAC system are small electrical motors that operate the vent flaps. They open/close based on the selection you made on the IHKA control panel. The flaps can be opened closed based on an automated signal from the system or by manual manipulation of the controls.
For instance, on cold days...the system uses an automated cold arrest feature that will close the vent flaps to prevent the system from blowing cold air on passengers until operating temps have been reached that will allow warmed air to be blown out the vents. At this point, the system will reopen the appropriate flaps based on the IHKA's settings. All of this is done by the actuators.
In the diagram below...the actuators are #6 in the diagram (and link to the part nbr database)...and there can be up to 13 of them distributed around the climate control system: