Windscreen cracking (quickly)

[smacxr8]

Hi all, we have a Mitsubishi Triton that we have had since new, its about 12 months old and we just noticed yesterday a crack started forming from the lower edge and over the last 24 hours it has worked its way about 350mm towards the centre of the windscreen. My question is what would cause this? There is no sign of any impact of any sort and no chipping. Could the expansion of the glass in the last couple of hot days contributed to a possible existing weak point? What has me baffled is the fact that it started at the very bottom edge.
Any help would be greatly appreciated!

[FrogInASock]

But you can't see the start of the crack which is behind the windscreen rubber?

Might just be a weak point, a tiny chip or scratch upon installation, weakened by any off road work, body twisting, errant flies attracting a closed fist (seen it, not done it!).

Any way, windscreens are a structural part of the car these days, and a 35cm and increasing crack is bad news. Best to call your local supplier.

[dave351cid]

proberly a a tiny chip or nik on the edge of the glass and the hot weather has been too much for it

[SLO AU XR8]

Had the Aircon on? That will do it if it cools too quick.