mustangc

I work for a sunroof supplier and I can say that cracks are not uncommon. If the glass is tempered then a chip small enough to penetrate only the outer tension layer of the glass can lead to the glass cracking. I’m not sure if Ford uses tempered glass or a laminated safety glass on the panoramic sunroofs used for the Edge. The long curly crack path you describe is more indicative of laminated glass, which can still crack due to impact or stress. If the crack was caused by an external force such as a rock chip, etc, then it would not be covered under warranty. It is correct that many insurance policies will cover it instead. It must have been an obvious chip if the dealership was able to determine the initiation point and the cause. Most dealerships I have worked with don’t have the expertise necessary to make that determination. Often the sunroof has to be sent back to the supplier for failure analysis. I have received lots of sunroofs back from my customers with the request “tell me why this cracked”. For those examples, usually the manufacturer repaired the claim under warranty as a courtesy to the customer and dealer.