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Open defogger filament
On our '86, we have an open filament within the center defogging element.
Only one filament is defective. Any way to correct this issue without a major surgery? Thanks in advance, Gerry ![]()
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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You can get a kit to fix it at about any auto parts store.
It's a conductive 'paint' that goes on over the break. If you mask and apply carefully it's not too noticable. |
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You can get this at any decent Auto Parts Store. I have repaired a few defrosters, works great. One tip, ythe brush they give you sucks. Go to a place that has paint brushes for artists and get a 4/0 or 5/0 brush.
![]() http://www.permatex.com/products/Automotive/specialized_maintenance_repair/auto_glass_lens_repair/Permatex_Quick_Grid_Rear_Window_Defogger_Repair_Ki t.htm
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Quote:
I did call Permatex, and was advised that the product they offer will not work on a single filament repair. Additionally I was advised to contact a "window" specialist. Thanks again, Gerry
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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Quote:
What!!! There seems to be a miscommunication. I have repaired several lines with this stuff. You just find the break in the line and paint on the stuff. I am assuming you are referring to one of the lines across the width of the windshield.
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how did you check the filaments?
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1973 911S (since new) RS MFI specs 1991 C2 Turbo |
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Don't know how Gerry will find the break, but my method once you find a dead one:
1-Put the key in the run position (note engine does not need to be running); 2-Set your volt meter to a suitable range (mine is set to 0-5 or 0-25 volts dc). 3-Connect the negative lead to a ground inthe car; 4-Turn on the defogger; 5-Touch the positive lead to the suspect line. If it reads zero volts, move down the line towards the driver side until you get a reading. If it reads some amount of volts, move down the line to the passenger side until it stops reading (the reading will decrease as you get closer to the passenger side). 6-The spot where the reading stops is where the break exists. Sometimes you can just see the break. Use the voltmeter to confirm.
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That's the stuff I was talking about.
I've used it also. Worked fine. |
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can you just check for continuity along the line?
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Carl,
Use of an ohmmeter does not work well because the individual lines are connected at both ends to a common "bus". You would be looking for a small change in resistance that you may or may not see. I find that the voltmeter method works very well.
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ahhh, that kinda makes sense. I just got a multimeter and am trying to figure out how to work the dern thing. lots o' features.
thanks
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Carl F 2000 Ruby Red Dodge Stratus with high performance racing stripe SE edition WTF? (sadly gone, but not forgotten) 1997 HOnda Accord "Shaggin Wagon" 1987 All black Targa 1998 Lemond Zurich/Dura Ace 2005 Jamis Dakar Sport 2006 Lemond Reno 2 DOgs , 2 Cats, Shi@ton of fleas 1 Cool as Hell Wife that tolerates my stupidity |
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Quote:
Thanks, I'll try a loop that is used for viewing slides and negatives to check for the location of the open circuit. Perhaps I did not communicate the issue to the folks at Permatex, however I thought that I was quite specific as to the single filament open circuit. The defective filament became quite obvious during the use of the defogger ckt last week. Question: Is the filament exposed out of the glass on the inside of the window? Thanks to all who responded to this anomoly. Gerry
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Quote:
Hopefully you will find the break visually, if not a $5 Harbor Freight voltmeter will do the trick.
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The defective filament was obvious during use.
I used a multimeter set on the VDC scale, connected the - to ground, and very lightly probed the defective filament from the inside on the driver's side, to the passenger side. When I lost voltage, the open was located. Good luck, Gerry
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." Last edited by 86 911 Targa; 02-28-2010 at 08:26 PM.. |
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