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  #1  
Old 10-30-2007, 09:02 AM
toomany MBZ's Avatar
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126 rear window defrost defog

Only the top few inches are working, the wires are the REALLY small ones. Can I jump any break? Is the wire laminated into the glass? "Glued" to the inside?

Thanks for any help.

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  #2  
Old 10-30-2007, 09:24 AM
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Quote:
Originally Posted by toomany MBZ View Post
Only the top few inches are working, the wires are the REALLY small ones. Can I jump any break? Is the wire laminated into the glass? "Glued" to the inside?

Thanks for any help.
I have the same problem on my 124, I am 95% sure that the tiny little wires are infact between the two panes of glass and that the only way to get a rear defroster to work is a new window.
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  #3  
Old 10-30-2007, 09:48 AM
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Yes, the heating element is laminated in the glass, hence $855 replacement cost.
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  #4  
Old 10-30-2007, 10:31 AM
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it happens if it delaminates do you have a foggy bottom of the glass looks like water in there.
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  #5  
Old 10-30-2007, 10:42 AM
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Yeah thats what happened along the top corners on my glass. Coincidentally the top part of the mesh is the area not working.
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  #6  
Old 10-30-2007, 11:28 AM
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I do have some discoloration, albeit in the lower passenger side.

Sigh...not gonna replace rear wind screen for this.
Attached Thumbnails
126 rear window defrost defog-white-one-011.jpg   126 rear window defrost defog-white-one-012.jpg  
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  #7  
Old 10-30-2007, 01:25 PM
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There is a way to repair it, using a multi meter and the special electricity conducting paint.
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  #8  
Old 10-30-2007, 01:49 PM
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not when, as previously noted, the wires are inside the glass. The special paint you speak of is for "lesser" vehicles that have the grid applied to the inside surface of the glass.
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  #9  
Old 10-30-2007, 01:50 PM
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Quote:
Originally Posted by rrgrassi View Post
There is a way to repair it, using a multi meter and the special electricity conducting paint.
how? do you have to drill into the glass? the wires are in between the two layers of glass? on the 126...
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  #10  
Old 10-30-2007, 01:51 PM
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On my w123 the grid is not between glass sheets.
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  #11  
Old 10-30-2007, 02:07 PM
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and on the 123 the wires are MUCH larger and more visible.
unfortunately the poster is asking about a 126...
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"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
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  #12  
Old 10-30-2007, 04:33 PM
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126 rear glass

You should be able to get a replacement rear window installed with an OEM one for about $500. I did in up here in Canada and parts are always cheaper in the US market. My 83 300sd had exactly the same problem as you.

It is a conventional rear window with the heating elements printed on the inside surface of the glass. All the shops I spoke to and several other Mercedes bulletin boards confirmed that the wires inside the two layers of glass on a 126 cannot be repaired......

Recommend you replace the rubber mounting seal at the same time and prime all metal. It's probably rusty under the seal in the bottom corners of the existing window.
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  #13  
Old 10-30-2007, 08:02 PM
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Originally Posted by rrgrassi View Post
On my w123 the grid is not between glass sheets.
On my late '82 123, it had the red element "glued" to the inside. My CD has the same wires as the SD, yet they are vertical, you may be able to see 'em on the SD being horizontal.

When I first bought the CD, I couldn't see anything in the rear windscreen, had to look real close, there they are!
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  #14  
Old 10-31-2007, 07:51 AM
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Two types of glass are used in MBs.....

Laminated and tempered.

Windshields are laminated, and side glass and rear windscreens are tempered......as a general rule.

Some MBs, have laminated rear windscreens, as well as windshields. The fine, almost invisible defrost wires are a way to identify the laminated rear glass.

Laminated glass consists of two panes of glass held together by a thin plastic sheet. Sheet may also be tinted to produce the dark band across the top of the windshield. When this plastic sheet gets wet, it will turn cloudy, and this is a sure fire sign that you are going to find some festering rust in the window channel.

Tempered glass is a single pane, stressed glass.

Ever notice how a windshield will break and not come apart? That's the plastic layer holding the glass together. Also note that a windshield will break in a manner that gives large, jagged pieces.

Tempered glass, because of it's cured tension-compression configuration, will better resist a blow, but when you overcome it's ability to remain of a piece, the entire pane literally crumbles into many small pieces.

Jim
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  #15  
Old 10-31-2007, 10:16 AM
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Quote:
Originally Posted by vstech View Post
and on the 123 the wires are MUCH larger and more visible.
unfortunately the poster is asking about a 126...
Yeah, but fortunately, I have a 123. I think mine my not be working, but haven't tried it yet. I will today. Thanks.

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