NHTSA Complaint #11572706 — 2024 KIA SPORTAGE

Not really sure what happened, but last week the temperature suddenly dropped below freezing and there was ice built up on the windshield. We started the car and turned on the windshield defrost at high and we began to drive the car after the windshield was clear of ice and about 10 minutes later we noticed a crack develop on the windshield going from where the hot air from the defrost was hitting the windshield. and through out the day we noticed the crack grow exactly along the line where the defrost air would hit it. The crack is connected to a 2 mm round spot where a rock chip hit the windshield a few weeks ago but the crack seems to have started because of the temperature difference that was caused by the windshield defrost.