Middle AC Vents Not Blowing
#2
Out Of Control!!
![](https://mbworld.org/forums/images/ranks/veteran_army.png)
Yes you have an issue with one or more flaps not working and therefore air passage to center vents is closed.
I am not sure with this Mod, but you may be able to run a diagnostic flap test with the AC control unit---post your VIN to confirm!
I am not sure with this Mod, but you may be able to run a diagnostic flap test with the AC control unit---post your VIN to confirm!
#3
Super Member
vacuum problem...see this thread..
success!!! got a connector for reservoir and voila, center vent blowing AC!!! If you have a center vent AC problem, start at the vent distribution box under glove compartment...I tested it with my mouth to see if suction....if none...trace back to air reservoir hidden behind wheel well (https://mbworld.org/forums/newreply....=714194)...see pics..etc...back to vacuum connection at engine....if any leaks along the way, the vents will all open and middle one stays closed....as soon as vacuum attached to distribution box, they should all operate normally.
success!!! got a connector for reservoir and voila, center vent blowing AC!!! If you have a center vent AC problem, start at the vent distribution box under glove compartment...I tested it with my mouth to see if suction....if none...trace back to air reservoir hidden behind wheel well (https://mbworld.org/forums/newreply....=714194)...see pics..etc...back to vacuum connection at engine....if any leaks along the way, the vents will all open and middle one stays closed....as soon as vacuum attached to distribution box, they should all operate normally.