The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
When you have a lack of vacuum.... (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by Grant on October 21, 2001 at 19:28:28:

In Reply to: 84' 733i a.c. vent problems posted by mike on October 21, 2001 at 11:52:33:


a.c. through the defrost? why?

the system defaults to the defrost position.

When you rev the engine you increase the vacuum supply for a short time, causing the sytem to try to set to the correct "select button" position.

As Jens suggest find out if the vacuum pump is working.

Check to see that the vacuum lines are in good condition.

Got to get the vacuum fixed before you trouble shoot further.



Follow Ups:


[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2009 Jump Internet Inc. All rights reserved.