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E85 / E86 Z4 (2003-2008)
E85 Z4 convertible and E86 Z4 coupe talk with our BMW gurus here.

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  #1  
Old 01-05-2013, 04:37 PM
edm6214 edm6214 is offline
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Location: Vancouver, BC
 
Join Date: Dec 2012
Posts: 4
Mein Auto: 2006 Z4 3.0i
wing mirror problem

Hi guys,

Here's an odd one. Yesterday as I pulled out of my garage one of the wing mirrors fell off. Not the whole assembly, just the mirror glass. It was undamaged when I picked it up, so I assume that I can just glue it back, But my question is "what glue to use"? I asked at the local dealer, but they were baffled "...it comes a complete unit, we don't glue anything".

Given that the mirrors are permanently heated when the car is running, the glue has to be able to withstand I guess 80degF to 90degF or thereabouts. Any suggestions? Will good old superglue do the trick?

As an aside, I've always wondered why the mirrors are permanently heated when the car is running - any ideas?

Thanks
D
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  #2  
Old 01-05-2013, 04:50 PM
vintage42's Avatar
vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 1,322
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by edm6214 View Post
... I've always wondered why the mirrors are permanently heated when the car is running - any ideas?...
Mirror defrosting draws too little current and it's expensive to add a switch.
My 2008 Forester LLBean has one switch for heated wiper perches in the windshield, and heated mirrors. The heating elements in the windshield are huge to melt solid ice, and draw a big current when on. They are worth switching off as they are not needed 99.99% of the time.
But heated mirrors just do light duty defrosting, do not do de-icing, don't draw much current, and are not worth switching in the Z3.

Last edited by vintage42; 01-05-2013 at 04:54 PM.
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  #3  
Old 01-05-2013, 07:01 PM
brock5ga brock5ga is offline
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Location: Monroe, GA
 
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Mein Auto: Z4
I would probably clean with alcohol and use a thin layer of 2 part epoxy.
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  #4  
Old 01-07-2013, 09:55 AM
SC2003Z4 SC2003Z4 is offline
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Location: Florence, SC
 
Join Date: Dec 2011
Posts: 127
Mein Auto: '03 Z4 2.5i Silver/Black
I bought the Burco inserts from eBay and replaced leaking dimming mirrors almost a year ago. They come with these "redi stick patches" (very thin double sided mirror tape, good for heated mirrors too). Give them a call and see if they'd sell you just the adhesive patches. 1-888-253-2593

Another option would be to silicone the mirror onto the plastic backing that the mirror originally sat on.
My advise, whatever you do, take off that plastic mirror backing and remove any and all adhesive material from it before you try to re-glue. When I did mine I actually used a putty knife to remove mirror from plastick back and then sanded the mirror tape off the plastic back.

To release backing from mirror assembly, turn that round part behind the mirror backing.
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2003 Z4 2.5i Silver/Black

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  #5  
Old 01-07-2013, 05:36 PM
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shipkiller shipkiller is offline
Underway on Nuclear Power
Location: Virginia Beach, VA
 
Join Date: Nov 2007
Posts: 868
Mein Auto: Me
On the Z4:

Mirror heating

Mirror heating is controlled by the door modules. The heating function is active as of terminal 15 (ignition lock position 2). The activation time is dependent on the outside temperature.
The general module receives the outside temperature from the IKE via the K-bus and determines a cycle time for heating operation. This time is transferred to the peripheral modules where it is carried out. Heating is no longer active at an outside temperature greater than 25 o C and it is switched on permanently at a temperature lower than -10 o C.




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  #6  
Old 01-07-2013, 08:09 PM
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Ron Stygar Ron Stygar is offline
19,585 Miles
Location: CT
 
Join Date: Mar 2002
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Mein Auto: Z4 M Coupe 6LL93033
Mirror

Someone sent me this knowing I was into it on the E36.

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  #7  
Old 01-21-2013, 09:10 PM
edm6214 edm6214 is offline
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Location: Vancouver, BC
 
Join Date: Dec 2012
Posts: 4
Mein Auto: 2006 Z4 3.0i
Guys,

I came across this website and the advice offered made sense. So I bought a tube of silicone RTV adhesive/sealant. I cleaned the heating element and the back of the mirror with lacquer thinners and dotted the heater pad as recommended. When you set the mirror on the pad, try to avoid transferring adhesive to the mirror surface. but if you do, Rainex will take it off tout suite!

http://www.auto-glass.com/carmirror.htm

So far so good. Gotta love a $6 fix!

Shipkiller - it rarely gets above 25degC in Vancouver, which explains why the wing mirror heaters are always on! :-)

Regards
Dave

Last edited by edm6214; 01-21-2013 at 09:12 PM.
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