Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E90/E91/E92/E93 (2006 - 2013)

E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 11-15-2013, 01:42 PM
Razorback1 Razorback1 is offline
Registered User
Location: Minnesota
 
Join Date: Nov 2013
Posts: 1
Mein Auto: 328 XDrive
What do those hot-cold knobs between the air vents do?

Today, I drove my car (2009 328 XDrive) on a highway for about 150 miles. On a cruise control, so I was resting my right shin on the center divider between the 2 front seats. After a while, I noticed that the side of the divider was getting unpleasantly hot (naturally, the heat was on). I called the BMW service, and I was told that this is quite normal, because heat pipes go through the divider to the rear seats.

The technician told me to simply turn the rotating knob between the two air vents in the rear seats all the way to cold (i.e. blue) position. As best as I understood the explanation - if the knob is in the hot (red) position, then the hot air is sent back through the divider, which contributes to overheating.

Naturally, I did that, but I'd still like to know - what exactly do those two hot-cold knobs do (the other one is in the front seat center panel)? What would happen if I turn the knob(s) to the "cold" position in winter? Hot position in summer?

Thank you very much for any explanation!!

Last edited by Razorback1; 11-15-2013 at 01:43 PM.
Reply With Quote
Ads by Google
  #2  
Old 11-15-2013, 01:48 PM
vrmoreno3 vrmoreno3 is offline
Registered User
Location: Alabama
 
Join Date: Apr 2007
Posts: 64
Mein Auto: 2008 335i
It is a air tempering mixing "control."
__________________
Reply With Quote
  #3  
Old 11-15-2013, 01:50 PM
vrmoreno3 vrmoreno3 is offline
Registered User
Location: Alabama
 
Join Date: Apr 2007
Posts: 64
Mein Auto: 2008 335i
Example: Even in the winter I usually keep my ac set to auto, ac on, and on 69ish. This allows the AC to keep the windows from fogging, and you can still mix some heat into it for warmth.
__________________
Reply With Quote
  #4  
Old 11-15-2013, 01:51 PM
CALWATERBOY's Avatar
CALWATERBOY CALWATERBOY is offline
Officially Welcomed to the 'Fest
Location: San Francisco
 
Join Date: Aug 2009
Posts: 9,737
Mein Auto: 2009 E93 N54
Quote:
Originally Posted by Razorback1 View Post
Today, I drove my car (2009 328 XDrive) on a highway for about 150 miles. On a cruise control, so I was resting my right shin on the center divider between the 2 front seats. After a while, I noticed that the side of the divider was getting unpleasantly hot (naturally, the heat was on). I called the BMW service, and I was told that this is quite normal, because heat pipes go through the divider to the rear seats.

The technician told me to simply turn the rotating knob between the two air vents in the rear seats all the way to cold (i.e. blue) position. As best as I understood the explanation - if the knob is in the hot (red) position, then the hot air is sent back through the divider, which contributes to overheating.

Naturally, I did that, but I'd still like to know - what exactly do those two hot-cold knobs do (the other one is in the front seat center panel)? What would happen if I turn the knob(s) to the "cold" position in winter? Hot position in summer?

Thank you very much for any explanation!!

Well, BMW traditionally includes a top/bottom temp control - you can adjust what comes out of dash vents independently of floor vents with that knob. Try!
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E90/E91/E92/E93 (2006 - 2013)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 10:50 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms