Climate Controls: Air Distribution Erratic

I

Incompatible

Active member
 San Diego
2007 Z4 3.0Si Coupe. I generally have the air flow set to exit the dash vents and turn the fan on/off as needed. I have noticed several times now that if I change the controls to redirect the air to the windshield defroster vents, the air flow does not change. If I turn the fan speed up to max, the air sounds like it's being blocked and the fan is straining. After switching the air flow control between the defroster, dash, and floor vents several times, eventually I can hear the air slowly being diverted to the indicated vent until full flow is acheived. The air flow control then works fine for a couple of weeks. It seems that the mechanism which controls the air flow is sticking. Is there a quick fix, such as an easy to reach part lubrication, or is it off to the dealer?
 
ovrkll said:
The aircon distribution does take a bit to cycle from one setting to the next.
Click to expand...

Yeah, it takes a tick or two, but he says it's not consistent. Maybe a switch or controller problem? Doesn't seem to be common, though as as this is the first complaint I've heard.
 
It's not the normal change over period, the internal air flow controler is stuck and will not change if let alone. Only after switching between the other settings; defroster, floor, and dash does the air flow eventually change, and then very slowly. Not a common problem and from the response on another forum, the remedy appears to be a change out of Part Number 64-11-6-936-894. Thanks for the response.
 
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