Coupe heated rear window

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Stumpy 81
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Coupe heated rear window

Post by Stumpy 81 » Mon Jul 27, 2020 10:52 am

Hi Folk.

Bought a club heated rear window for my regularly used Straight Six. Misting up can always be a problem in the winter. So since the ancient extrusion rubbers were unlikely to be reusable, I bought new from one of our traders. The experienced professional fitters struggled for a while and after two separate attempts had to refit the original window.

Our trusty trader says that trying to fit this 6mm laminated unit risks damaging the bodywork, and that the club shouldn't be selling them. My survey of available extrusions also indicates that there isn't one that will work.

Has anyone succeeded where I and the experts have failed, or is it a case of rejecting the unit as unfit for purpose!!
Tony H.



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Post by peter freeman » Mon Jul 27, 2020 11:01 am

I've got one in the loft but never tried to get it fitted - I have a ex PC fan to keep the rear window clear - takes a while to clear but once its clear it keeps it clear. Surprised the new widow is thicker as the element is inside the glass same as the old one whereas the replacement rear hatch is thicker because the element is inside and not just "printed" on the glass



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Coupe heated rear window

Post by Stumpy 81 » Mon Jul 27, 2020 12:05 pm

Coupe window construction is the same as the club rear hatch glass. ie: element laminated between two layers of glass. So total thickness is the same as a front screen, 1/4 ins in old units. Unfortunately the front screen extrusion won't fit in the body recess at the rear. The original toughened glass " Triplex" rear window is substantially thinner.



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Post by Stumpy 81 » Sat Aug 01, 2020 9:53 am

No real progress! Iain Daniels tells me he has fitted some Club rear windows using the current front screen rubber which overlaps the bodywork. However, this approach didn't work for me. So the problem is back with the manufacturers. Careful measurements indicate that the heated window is too large for the aperture.
The manufacturer claims a 1mm tolerance. Some use in a Reliant body where we're lucky to get 3mm!!
Has anyone on the site got helpful experience?



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Post by scimjim » Sat Aug 01, 2020 10:06 am

I have front and rear screens to refit but seem to recall people having problems with the coupe roof sagging? Possibly due to the lack of rollbar but they are thinner than the GTE. From your measurements is it only height that’s out, or width too?


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Post by peter freeman » Sat Aug 01, 2020 11:08 am

When you try to put the rear window in the roof will bend - took three "old" hands to get mine in two inside the car to hold the roof up



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Post by Stumpy 81 » Sat Aug 01, 2020 8:51 pm

Thanks for your input Jim & Peter. Without a window the Coupe roof is indeed VERY flexible. However, height was not a problem with hands inside and out.
The width at the top was the killer by just a few mill's. Careful measurement and comparison with the existing unit (manufacturing date 1964) showed that the heated window was indeed wider at that point. Ricky Evans say the dimensional tolerance is +/- 1mm ! So perhaps a combination of their and Reliant's tolerances makes me the unlucky one.
Cheers, Tony.



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Post by scimjim » Sat Aug 01, 2020 8:59 pm

It’s the same screen as a 5 series, has anyone fitted one to a 5/5a?


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Post by Coupe Racing » Sat Aug 01, 2020 9:14 pm

scimjim wrote:
Sat Aug 01, 2020 8:59 pm
It’s the same screen as a 5 series, has anyone fitted one to a 5/5a?
Rear screen?


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Coupe heated rear window

Post by scimjim » Sat Aug 01, 2020 10:36 pm

Sorry, talk of front screen rubbers confused it :D


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Post by Stephenl » Sun Aug 02, 2020 7:24 am

Stumpy 81 wrote:
Sat Aug 01, 2020 8:51 pm
Thanks for your input Jim & Peter. Without a window the Coupe roof is indeed VERY flexible. However, height was not a problem with hands inside and out.
The width at the top was the killer by just a few mill's. Careful measurement and comparison with the existing unit (manufacturing date 1964) showed that the heated window was indeed wider at that point. Ricky Evans say the dimensional tolerance is +/- 1mm ! So perhaps a combination of their and Reliant's tolerances makes me the unlucky one.
Cheers, Tony.
Can you grind the body aperture to fit the new window?


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Post by Stumpy 81 » Mon Aug 03, 2020 9:41 am

I think not! The rebate has to be maintained. Otherwise the extrusion won't seat correctly.
Don't know how the three section glass laminate is sized. Perhaps the glasses are ground to tolerance. My guess is that when the original dimensions of the thinner toughened window were copied back in 2012/3 allowence wasn't made for the use of the windscreen extrusion which is the only one that can accommodate the thicker laminated glass of the heated unit. This reduces the available aperture by 2mm around the periphery. Enough to produce a fit or no-fit depending on body accuracy.
I think it's a case of back to the drawing board! At least I now have excellent new rubber in place after 54 years.



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Coupe heated rear window

Post by philhoward » Mon Aug 03, 2020 9:48 am

I believe the screen was made to the identical size as the original (as one was supplied on loan to Ricky for a pattern) - but looks like the thickness wasn't considered, or wasn't seen to be a problem? I vaguely recall a discussion at the time that the new one couldn't be made as thin as the original though.

I think Alex (ard126k) recently organised manufacture of an obsolete seal so short run seal manufacture is certainly possible these days. Doesn't fix your immediate problem though. Maybe worth a chat with Alex and Nigel at QRG?


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Coupe heated rear window

Post by Stumpy 81 » Mon Aug 03, 2020 12:27 pm

Nigel told me originally "not to bother: they don't fit". Serves me right to try!!
However, having gone this far, and being a stubborn blighter by reputation, I'm intending to complete the exercise for my benefit and other Coupe owners who like to use their cars during the winter months.

Thanks to all for your interest. I'll keep you posted.



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Post by DARK STAR » Mon Aug 03, 2020 1:31 pm

Don't Woolies have anything that would do the job ?

https://www.woolies-trim.co.uk/category ... en-section


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