E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 06-17-2012, 02:25 PM   #1
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
A/C Ouput issue

This is a 2002 M3 6MT with 93k.

I've been having an issue with my A/C: with the system on and the output selector set for the middle (in your face) position only, I get cold air out of the side vents and hot air out of the middle vents. If I switch to the top (windshield) vent, I only get hot air towards the windshield. If turn on both the bottom (foot) and middle (face) outputs, I get cold air out of the middle, and hot air from the foot outlet; by "hot" I mean hot.

Yes, the center dash dial selector is set to the proper position.

The refrigerant level is fine, and the fan and compressor seem to be kicking in when they're supposed to.

Engine temps are normal.

When I get cold air, it's cold, but I shouldn't be getting hot air from other vents at the same time.

I suspected it might be the final stage resistor, but from what I've read (and previous experience) a bad FSR affects fan speed or shuts the fan down altogether.

It is 100+ right now, and we had to take the wife's Saabaru downtown to dinner last night because of a lack of A/C :shame:
thomn8r is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 06-17-2012, 02:47 PM   #2
mq124
Registered User
 
Join Date: Aug 2010
Location: West Chester, PA
Posts: 449
My Ride: slow and sorta low
I had a very similar problem in mine. Mine would blow hot air out the top and bottom and slightly cool air out the middle even with all selected to max cold setting. Mine had a fresh recharge and everything seemed to be functioning properly. I even took it to the dealer and they told me it was a bad heater control valve which restricts or allows flow to the heater core however this did not solve my problem. The heater/AC module in my car turned out to be bad so I bought a used one out of a parts car on ebay. If you have access to someone with an e46 ask if he/she would mind you swapping the modules (the unit in the dash) and see if that fixes your problems. I have a hunch it will but that way you dont have to commit to spending any money. Also, the heater control valve, also known as the heater water valve, could be bad. This valve allows or restrict coolant to the heater core and the theory is that if the valve is stuck open the heat created will overpower any AC you have working at the time. I know there is a way to test these valves but I do not remember off hand. Hopefully this helps a bit as I was beating my head against the wall trying to figure mine out. If you have any questions feel free to PM me
__________________
mq124 is offline   Reply With Quote
Old 06-17-2012, 04:03 PM   #3
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
Thanks for the tip!

I did a search on heater control valve and came up with this post which seems to describe the problem to a "T"

I'll try replacing the valve and see what happens.
thomn8r is offline   Reply With Quote
Old 06-17-2012, 08:40 PM   #4
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
Is this the correct valve? http://bmwfans.info/parts/catalog/E4...s_water_valve/

64 11 8 369 807

Item # 2

thomn8r is offline   Reply With Quote
Old 06-18-2012, 01:04 AM   #5
rlddlr53
Registered User
 
Join Date: Mar 2012
Location: Thousand Oaks, Ca
Posts: 18
My Ride: 92 325ic bye m3
Yes, that valve is what causes the hot air in the middle. Had this problem on my m3 a few months ago
rlddlr53 is offline   Reply With Quote
Old 06-18-2012, 07:26 AM   #6
jasonbimmer
Registered User
 
Join Date: Sep 2011
Location: Omaha, NE
Posts: 5,686
My Ride: 2001 BMW 330xi
anytime you have hot air mixing with AC its this valve's issue.
__________________
2009 Mazda RX-8 R3
2013 Toyota FJ Cruiser
2008 YAMAHA YZF-R6
jasonbimmer is offline   Reply With Quote
Old 06-29-2012, 08:27 AM   #7
e46mook
Registered User
 
Join Date: Sep 2009
Location: Tampa, FL
Posts: 221
My Ride: 2004 330cic
let me know if this valve replacement fixed your issue because I have a similar problem. All of my searching has ended with replacement of this valve or some control module behind the dash
__________________
Remus - Dinan - H&R - AC Schnitzer
e46mook is offline   Reply With Quote
Old 06-29-2012, 08:39 AM   #8
jasonbimmer
Registered User
 
Join Date: Sep 2011
Location: Omaha, NE
Posts: 5,686
My Ride: 2001 BMW 330xi
Quote:
Originally Posted by e46mook View Post
let me know if this valve replacement fixed your issue because I have a similar problem. All of my searching has ended with replacement of this valve or some control module behind the dash
it surely fixed mine. if your AC is on and set temp is lower than inside the car, the heater SHOULD not be on at all.
__________________
2009 Mazda RX-8 R3
2013 Toyota FJ Cruiser
2008 YAMAHA YZF-R6
jasonbimmer is offline   Reply With Quote
Old 06-29-2012, 08:42 AM   #9
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
I just got the valve a couple of days ago, and I plan to do the replacement tomorrow morning.
thomn8r is offline   Reply With Quote
Old 06-29-2012, 08:48 AM   #10
jasonbimmer
Registered User
 
Join Date: Sep 2011
Location: Omaha, NE
Posts: 5,686
My Ride: 2001 BMW 330xi
Quote:
Originally Posted by thomn8r View Post
I just got the valve a couple of days ago, and I plan to do the replacement tomorrow morning.
have some coolant ready cuz you might lose some.
__________________
2009 Mazda RX-8 R3
2013 Toyota FJ Cruiser
2008 YAMAHA YZF-R6
jasonbimmer is offline   Reply With Quote
Old 06-30-2012, 12:31 PM   #11
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
Done - replaced the valve this morning. It took about an hour and a half because I lolligagged it. This indeed fixed the problem.
Attached Thumbnails
Click image for larger version

Name:	DSC_0177.jpg
Views:	43
Size:	72.1 KB
ID:	458719   Click image for larger version

Name:	DSC_0187.jpg
Views:	39
Size:	148.0 KB
ID:	458720  
thomn8r is offline   Reply With Quote
Old 06-30-2012, 02:23 PM   #12
jasonbimmer
Registered User
 
Join Date: Sep 2011
Location: Omaha, NE
Posts: 5,686
My Ride: 2001 BMW 330xi
Quote:
Originally Posted by thomn8r View Post
Done - replaced the valve this morning. It took about an hour and a half because I lolligagged it. This indeed fixed the problem.
very interesting M3's got a different one.
__________________
2009 Mazda RX-8 R3
2013 Toyota FJ Cruiser
2008 YAMAHA YZF-R6
jasonbimmer is offline   Reply With Quote
Old 06-30-2012, 02:33 PM   #13
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
Quote:
Originally Posted by jasonbimmer View Post
very interesting M3's got a different one.
The M3 has a different (and more expensive) everything. The valve was $215 from Tischer
thomn8r is offline   Reply With Quote
Old 07-14-2012, 11:17 PM   #14
BWOODM3
Registered User
 
Join Date: Dec 2010
Location: Brentwood, CA
Posts: 408
My Ride: 2002 M3 convertible
did you have to get it coded? would you happen to have anymore pictures of the location of it as well? :d
BWOODM3 is offline   Reply With Quote
Old 07-15-2012, 12:01 AM   #15
thomn8r
Registered User
 
Join Date: Jun 2012
Location: Carmichael
Posts: 16
My Ride: 2002 6MT M3
Quote:
Originally Posted by BWOODM3 View Post
did you have to get it coded? would you happen to have anymore pictures of the location of it as well? :d
I didn't have to get it coded. This thing is easy to find - it's right under and behind the airbox. I have a couple pix, but they're on another PC.
thomn8r is offline   Reply With Quote
Old 07-15-2012, 09:07 AM   #16
mmaldin
Registered User
 
Join Date: Mar 2006
Location: Boulder, CO
Posts: 89
My Ride: '04 325xit '94 325i
I replaced mine with good results this week too. I clamped the hoses and lost very little coolant. Very easy and accessible DIY.
mmaldin is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Censor is ON





All times are GMT -5. The time now is 09:45 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use