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 > 7 Series / 8 Series > 7 Series - E65 / E66 (2002 - 2008)

7 Series - E65 / E66 (2002 - 2008)
Discussion pertaining to the flagship BMW here.

Reply
 
Thread Tools Display Modes
  #1  
Old 01-24-2013, 08:49 AM
Nicoromag Nicoromag is offline
Registered User
Location: Miami Beach
 
Join Date: Jan 2013
Posts: 24
Mein Auto: 2004 BMW 745i
AC wacky behavior

Hello to all members, this is my first day and post as a new beemer owner. I just purchased a 2004 BMW 745i and at first noticed the AC blowing warmer than it is programmed on screen on drivers' side but would blow cold as programmed in passenger side while being set for the same temperature in both sides, in addition, the AC panel lights would blink randomly on and off for a short period of time and get back to steady on. Last night the AC panel light wouldn't turn on at all, but the AC itself wouldn't stop blowing heat at 127f (which i had to block the vents and open windows in order to not pass out..) I tried pressing the off AC button and then turning the car off and start it back on to see if it would restart the computer but no luck in both cases. Curiously enough, after a couple of hours of the car being off the AC came back to its original issue (incorrect dual temperature)
Please help!

Last edited by Nicoromag; 01-24-2013 at 08:50 AM. Reason: Greeting inclusion
Reply With Quote
Advertisement
  #2  
Old 01-24-2013, 01:33 PM
hd750Li's Avatar
hd750Li hd750Li is offline
Officially Welcomed to the 'Fest
Location: US
 
Join Date: Jul 2010
Posts: 555
Mein Auto: 2008/2011 750Li
There's probably an issue with the AC regulator unit which is underneath the glove box. Very easy to replace. OEM brand new cost about $180 part # 64116934390. You probably could find a cheaper used one on eBay.
Reply With Quote
  #3  
Old 01-24-2013, 02:14 PM
Nicoromag Nicoromag is offline
Registered User
Location: Miami Beach
 
Join Date: Jan 2013
Posts: 24
Mein Auto: 2004 BMW 745i
Thank you for the reply! What worries me is the little "lights show" of the panel and the fact of shutting down of the system while still working, would that be also related to the regulator? doesnt the reg just controls the temperature? Climate panel is ruled out?
Reply With Quote
  #4  
Old 01-24-2013, 04:17 PM
hd750Li's Avatar
hd750Li hd750Li is offline
Officially Welcomed to the 'Fest
Location: US
 
Join Date: Jul 2010
Posts: 555
Mein Auto: 2008/2011 750Li
No, not entirely ruled out yet. As a matter of fact, I had my panel replaced under warranty.
But the AC blower was still very weak and making bird chirping noise. I replaced both the blower and regulator. Problem fixed!
The BMW technician suspected things started going wrong with the regulator since he has fixed so many cars for that same problem.
FYI, the AC panel is $900.
Reply With Quote
  #5  
Old 01-24-2013, 06:01 PM
Nicoromag Nicoromag is offline
Registered User
Location: Miami Beach
 
Join Date: Jan 2013
Posts: 24
Mein Auto: 2004 BMW 745i
Great insight! I do get a noise too, but I would say it is more like a cycling wistling in my case. Mechanic said it could be a closed vent or stuffy AC filter, (wich I checked and were clean) no chirping for sure since noise is a on-and-off smooth but really annoying high-pitch vacuum-like noise.

Now, about that regulator, there is one on ebay posted at $100 with return policy, I'im thinking going down the list and eliminate possible scenarios, like you said, BMW tech guy believed it all started with that regulator so it may be worth give it a try.

I just turned the car on and the panel blinked like crazy and screen temperature was flashing back and forth from the set temp (74f) to 127f until I pressed the snowflake button (could be coincidence too) then it went back to uneven temperatures on each side of car. There's a used panel, from a front-crashed 750li that's compatible if needed.

You said it easy to replace the regulator, and I am decent on mechanic skills. Need to take the lower console apart perhaps? Hoping for that cheap fix I guess!

Last edited by Nicoromag; 01-24-2013 at 06:12 PM. Reason: grammar
Reply With Quote
  #6  
Old 01-24-2013, 07:41 PM
hd750Li's Avatar
hd750Li hd750Li is offline
Officially Welcomed to the 'Fest
Location: US
 
Join Date: Jul 2010
Posts: 555
Mein Auto: 2008/2011 750Li
Be careful with used regulator unit. This part tends to go bad after a few years in hot+humid climate. If your AC blower has started making noise already, I highly recommend to replace it too. They are connected together by two screws.

See this video for a DIY:

Reply With Quote
  #7  
Old 01-25-2013, 06:00 AM
sirstopher's Avatar
sirstopher sirstopher is offline
bimmerfest Supporting Member
Location: Ok.
 
Join Date: Aug 2011
Posts: 1,100
Mein Auto: POS Honda
If this is the part that sits ontop of the fan I think I have one.

I sold my car last week PM me
__________________
97 740i e38 - SOLD
02 745i e65
03 Montero Limited

Reply With Quote
  #8  
Old 01-25-2013, 06:02 AM
sirstopher's Avatar
sirstopher sirstopher is offline
bimmerfest Supporting Member
Location: Ok.
 
Join Date: Aug 2011
Posts: 1,100
Mein Auto: POS Honda
Chirping or rattle noise can be fixed by using a couple of drops of sewing machine oil at the bushing on top.
__________________
97 740i e38 - SOLD
02 745i e65
03 Montero Limited

Reply With Quote
  #9  
Old 01-25-2013, 04:18 PM
Nicoromag Nicoromag is offline
Registered User
Location: Miami Beach
 
Join Date: Jan 2013
Posts: 24
Mein Auto: 2004 BMW 745i
Thank you for the info, I gave it a couple of test runs and didn't blink and after restarting the car after lowering temperature to 60f and fan to lowest driver's temperature accuracy improved greatly. Before going into a witch hunt swapping used parts (because I refuse to spend $850 in a new panel or regulator for the matter) I will wait and see how it behaves in the next couple of weeks. But i have a panel in ebay lined up just in case of frustration/panic attack.

Last edited by Nicoromag; 02-04-2013 at 09:06 PM.
Reply With Quote
  #10  
Old 02-04-2013, 02:00 PM
Nicoromag Nicoromag is offline
Registered User
Location: Miami Beach
 
Join Date: Jan 2013
Posts: 24
Mein Auto: 2004 BMW 745i
Ok, decided to go in a DIY used parts witch hunt after all. Replaced the regulator (ebay-new) and climate panel (ebay-low mileage), and no more "lights show" or blower shutting down by itself.

But temperature still uneven! Added freon and voila! A/C as good as new!!! (So far...!) YEY! Take that stealer! I mean dealer...

Thank you guys, without that video I could've never done it!

Last edited by Nicoromag; 02-04-2013 at 03:29 PM.
Reply With Quote
  #11  
Old 02-04-2013, 03:30 PM
Ultimate745i Ultimate745i is offline
Ultimate745i
Location: Jacksonville, Florida
 
Join Date: Jan 2013
Posts: 509
Mein Auto: 2004 745i
Quote:
Originally Posted by hd750Li View Post
If your AC blower has started making noise already, I highly recommend to replace it too.
No need for that...just shoot some WD-40 or 3-1 oil on top and bottom of motor shaft. Easy DIY fix!
__________________
Fun Doesnt Come Cheap!
Reply With Quote
  #12  
Old 02-06-2013, 12:05 PM
Nicoromag Nicoromag is offline
Registered User
Location: Miami Beach
 
Join Date: Jan 2013
Posts: 24
Mein Auto: 2004 BMW 745i
Btw, I did lube the shaft in blower, both ends with sewing machine oil and still hear a small rattle.
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E65 / E66 (2002 - 2008)
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 10:07 PM.


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