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Author Topic: Rear window demist  (Read 1426 times)
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HBG
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Posts: 222


« on: 20 October, 2023, 03:01:18 PM »

Hi folks.

My rear screen demist doesn't work. I've tested what I believe are the wires in the boot and have 12v when switched on and what seems like a good earth. When disconnected I do not have continuity through the back wires that lead to the screen.

Any suggestions what to do next?


* 20231020_154949.jpg (2804.5 KB, 4032x3024 - viewed 45 times.)
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dhla40
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Posts: 178


« Reply #1 on: 20 October, 2023, 03:43:11 PM »

For the screen to work I think the resistance should not be more than a few ohms, unfortunately because the wires are embedded in the glass the usual element repair kits are no good. If you want to risk it you can remove the screen and try to clean up the copper contacts but I think you will probably have to find another screen.

Sean
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1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
HBG
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Posts: 222


« Reply #2 on: 20 October, 2023, 08:26:26 PM »

I can't face removing the screen as I want to keep the car on the road. The wires rise up through the parcel shelf and disappear behind the screen rubber. Do you know what sort of connection there is there? Could that be where a problem lies?
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lancialulu
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Posts: 4935



« Reply #3 on: 20 October, 2023, 10:16:36 PM »

I can't face removing the screen as I want to keep the car on the road. The wires rise up through the parcel shelf and disappear behind the screen rubber. Do you know what sort of connection there is there? Could that be where a problem lies?
fairly fragile from memory
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
dhla40
Senior Member
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Posts: 178


« Reply #4 on: 21 October, 2023, 08:03:20 AM »

Yes, those are the contacts, there is a copper strip that goes round the edge of the screen and the wires are attached to either end. You have to remove the rubber to get to them.

Sean
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1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
HBG
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Posts: 222


« Reply #5 on: 27 October, 2023, 05:49:07 PM »

Anyone got a pic of the terminals on the glass? I'd like to see where and how the wires connect to the screen. Not going to give up on it yet!

Thanks
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LCR1967
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Posts: 23


« Reply #6 on: 02 November, 2023, 03:19:41 PM »

Without trying to hijack this thread. Has anyone installed/fitted an aftermarket rear screen heater like this one: https://www.holden.co.uk/p/screen_heater_12_volt?s
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HBG
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Posts: 222


« Reply #7 on: 02 November, 2023, 03:30:05 PM »

I had a look at that from Holden but imagine it wouldn't be an elegant solution.

Not yet seen a pic of the screen contacts, so I don't know if mine is repairable insitu.

If I could get a stick on element that ran along the bottom of the screen I'd be happy.
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lancialulu
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« Reply #8 on: 02 November, 2023, 06:06:15 PM »

Seen this.

Being sold by a member....

https://www.ebay.co.uk/itm/155171266716?hash=item2420eda09c:g:yJwAAOSwzCdjKaJG&amdata=enc%3AAQAIAAAAwGbePEuEgzNfhMKpbRyTpRgjqV2xbeKucuamL4hQXTiVC07bRlcbmgW7pr2Wnul2OfhsTci9Q%2Fgewri2scQp%2BBEDNPtmmTS9yCN9sXVvQD9HfBTDFmihVflVAa5WjggRs%2F4FbjXQXIKPUFrZMMu4RCGHNndbGSJS2Oa%2BFWrd12%2Fx99HjXtdDX4mNTCBHTCtj%2FyLGm%2BQ17yyHMOo19x%2F72HhkbQauP9XameTLRVIaabBik0b88AKD480Jg%2FaTcgWDtw%3D%3D%7Ctkp%3ABk9SR-63-5LyYg
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
HBG
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Posts: 222


« Reply #9 on: 20 December, 2023, 05:24:41 PM »

Had the rear screen out yesterday to investigate. Continuity from the wires through the brass channel and the copper strip around the edges to the ally tape within the glass laminate. Then nothing between the ally tape at each side. Really close inspection of the filaments meeting the ally tape showed corrosion and breakage.

So this screen won't ever heat again. It's back in for now, possibly forever as a new heated rear screen isn't available and I don't think I'll bother with a second hand one. So far in my ownership the rear screen has cleared quickly as the car warms up.


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SanRemo78
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Posts: 830



« Reply #10 on: 22 December, 2023, 10:22:33 PM »

This company makes a heated front windscreen for the Fulvia.

https://www.heatedwindscreen.com/collections/lancia/Standard-Windscreen

If you wanted them to see if they could make a replacement heated rear screen for you (or a consortium) all I think they need is a pattern screen? Someone must have one lying around doing not very much?

Guy
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GlynW
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Posts: 39


Fulvia S2 1600HF (1971)


« Reply #11 on: 23 December, 2023, 09:01:34 PM »

This company makes a heated front windscreen for the Fulvia.

https://www.heatedwindscreen.com/collections/lancia/Standard-Windscreen
Hi Guy,
Although they do list heated windscreens for Delta, Montecarlo and Stratos, the Fulvia front screen is in their 'standard' (i.e. non-heated) range.  It might be worth an enquiry though about custom heated rear screens, if this is an issue for many people.
Glyn
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HBG
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Posts: 222


« Reply #12 on: 23 December, 2023, 09:04:45 PM »

A short while ago I emailed and spoke to 3 or 4 manufacturers of low volume screens. They all said they couldn't or wouldn't replicate the Fulvia rear screen.

Perhaps with a big enough order someone might, but I don't have the ability to organise such.
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