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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 05-08-2012, 10:31 AM
Z3NOLA Z3NOLA is offline
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Location: New Orleans
 
Join Date: May 2012
Posts: 3
Mein Auto: 1999 BMW Z3 roadster 2.3L
1999 Z3 a/c problem

hello all!
this is my first post on this website. i usually just browse through the forums. extremely interesting site for bmw owners.
here is my problem:

whenever i turn the ac on it kicks the heater on full blast whether the knob is turned to hot or cold. could this be as simple as changing the temperature dials out or replacing the ac on/off button(below the dials, with the blue light indicating its on)???
any advice would be great!
Louisiana summers are soooo hot!
thanks!
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  #2  
Old 05-08-2012, 11:13 AM
flossy21 flossy21 is offline
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Location: Williamsburg, VA
 
Join Date: Jul 2008
Posts: 32
Mein Auto: Ford Explorer
Quote:
Originally Posted by Z3NOLA View Post
hello all!
this is my first post on this website. i usually just browse through the forums. extremely interesting site for bmw owners.
here is my problem:

whenever i turn the ac on it kicks the heater on full blast whether the knob is turned to hot or cold. could this be as simple as changing the temperature dials out or replacing the ac on/off button(below the dials, with the blue light indicating its on)???
any advice would be great!
Louisiana summers are soooo hot!
thanks!
Do vents also blow hot air when the AC is off and the dial is turned to cool. In other words will it blow non-heated air at all with any setting?

My guess is that the hot/cool dial is not actuating over to cool. I know mind is difficult to turn from one to the other at the midpoint. I have read on these forums that this is a failure point for some cars and requires replacement of the failed parts.
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  #3  
Old 05-08-2012, 12:15 PM
Blacklane Blacklane is online now
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Location: Springfield, Ohio, USA
 
Join Date: Jun 2011
Posts: 872
Mein Auto: 1998 Z3 Roadster
A common failure mode is the air blend door inside the air duct that switches between heating and air conditioning coils. The rubber seal gets gummy and it sticks, then someone turns the control knob hard enough to break a piece off of the back of the knob. If that's the problem, the solution is pretty involved.

Look through this thread:
http://www.bimmerfest.com/forums/sho...d.php?t=318432
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  #4  
Old 05-08-2012, 02:33 PM
Z3NOLA Z3NOLA is offline
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Location: New Orleans
 
Join Date: May 2012
Posts: 3
Mein Auto: 1999 BMW Z3 roadster 2.3L
Quote:
Originally Posted by flossy21 View Post
Do vents also blow hot air when the AC is off and the dial is turned to cool. In other words will it blow non-heated air at all with any setting?

My guess is that the hot/cool dial is not actuating over to cool. I know mind is difficult to turn from one to the other at the midpoint. I have read on these forums that this is a failure point for some cars and requires replacement of the failed parts.
heated air blows all the time. with every setting it seems the heater is always on. i cant get it to blow neutral temped air at all.
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  #5  
Old 05-08-2012, 07:18 PM
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Steamer Steamer is offline
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Location: Clovis, Ca
 
Join Date: Apr 2011
Posts: 213
Mein Auto: 2011 550i, 00 M Roadster
Check out Blacklane's link, should get you headed in the right direction
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  #6  
Old 05-08-2012, 07:26 PM
Z3NOLA Z3NOLA is offline
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Location: New Orleans
 
Join Date: May 2012
Posts: 3
Mein Auto: 1999 BMW Z3 roadster 2.3L
*resolved
i went to auto zone and bought a freon recharge kit. after messing with the dial and noticing a slight change in the coolness of temperature, i concluded that the freon may be the issue. $24 later my ac is working beautifully!!!
you have no idea how happy i am.
thanks for the input fellas.
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  #7  
Old 05-10-2012, 06:00 PM
DaveBZ3 DaveBZ3 is offline
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Location: Atlanta, Ga
 
Join Date: Feb 2012
Posts: 85
Mein Auto: Z3
If you have future problems, a common problem is the tempature control dial, which moves an arm on the back side. The arm has a little plastic tab that goes into a slot in the back of the dial. The tab can easily break off.

Getting to it requires taking out the console, which was a major PITA. Once I got to it I actually used epoxy glue (JB Weld) a fender washer and a screw and glued on a new tab onto the arm.

I say the fix is around 100 times stronger than the original.
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  #8  
Old 05-11-2012, 02:54 AM
ashevillez3 ashevillez3 is offline
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Location: Asheville, NC
 
Join Date: Jan 2012
Posts: 37
Mein Auto: 2000 Z3 2.8 Roadster
I've got to repair the temp control dial as well. We have a good freon charge and when the a/c blow it blows cold. But annoying during the summer when its hot outside and the a/c is blowing heat instead.
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