Quote Originally Posted by black olive View Post
Hi Malcolm.

Have a look in the bible, the gospel according to the atc system on P81.
Black olive decrees that the issue may be either the distribution servo motor or the balance valve for the dual climate ATC.
OK - thanks Steve - I find that I have already downloaded the bible at some earlier point so I've read the relevant section but am none the wiser really! So what would be causing one of these servos to be operating continuously? Would it have become disconnected somehow from whatever flap it is trying to operate, and so therefore keeps trying? Everything seems to work correctly with air distribution. And is there some way I could diagnose which one might be playing up before I rip into the dashboard? Would that diagnostic test on the ATC help and perhaps throw up an error code?