stoddmi

Hello All,

We just picked up a CPO 2014 C250. We bought it on a cloudy day, but the next day when it was sunny we noticed a grid of circles on the back window. They were visible in sunlight. Or, if I wore polarized sunglasses they were visible all the time. Is this a defect? I've read other forums saying this was typical in cheaper windows, but is this common for Mercedes? I called the local dealership and they told me to take a picture and email it to the service manager.

Opinions?

Thanks,
Mike
Austin, TX

StanNH

I've seen patterns on lots of car window glass. I was told it was the laminate material in the safety glass. I do not believe this is in any way a defect.

Merlin1

Maybe marks from the rubber suction pads they use when installing window.

Count Laszlo

If it looks something like this 100% normal. Not just to Mercedes.

Leslielp

Its is normal to see the glass manufacturing patterns in polarized light but under normal sunlight they should be invisible. If its a uniform pattern, it would most likely be the glass manufacturing process.


It is something that you should have noticed if you wear those Polarized glasses while driving. You will see the various patterns of the rear windshields by the differing manufacturers.

stoddmi

It is similar to the pattern in Count Lazlo's post. Thanks for all the input. I will try to post a pic once the sun comes out.
Thank you all again.
Stoddmi

Mefis

Hello, i was also wondering about that phenomena. I see it in all types of cars, old and new. I wonder if it also can be the result of a cymatic result (see youtube videos for explanation about visible sound). Every day we are more surrounded by frequencies of all kind (radar, wi fi, cel phones, bluetooth, satelite). Maybe some of those frequencies are causing the paterns that so many attribute to manufacturing processes. If its so, then we should be worry of some other effects. Any way, it´s just an other hypothesis.