NHTSA Complaint #11452594 — 2016 FORD F-150

we bought this used truck from the ford dealership only 3 months prior! the car max report and other research we did before buying showed 0 issues like this with the truck. we used auto start, which does turn rear defrost on max, leaving a store parking lot. driving through parking lot pulling up to stop light less than 5 minutes after starting truck and as we begin to slow down we heard a terrifying loud explosion sound. we turned around and the entire rear windshield had shattered into tiny glass pieces. some small pieces of glass hit us and some was on the backseat and on the truck bed cover. there were no significant holes of any size or items around the inside or outside of the truck that could have caused the damage. thankfully we were slowing down while driving otherwise we could have been in a wreck with how loud the sound was! dealership we bought it from refused to acknowledge the issue or even help pay for damage! no warning lights or anything else showed up before or after it happened. we did our reasearch after to find what caused it and now it is obvious based on others reported experiences that it was from the rear defrost being on thanks to the auro start function. we still have not had it fixed since quotes from dealership and 3rd party places without insurance are around $700-$1000. with insurance we would have to pay a $500 deductible and they would cover the rest. we have a powerslide window on the rear windshield to which increases the cost too! we even paid the dealership the extra several hundred dollars for the extended warrenty when we bought the truck and they refuse to cover anything with glass! no resolution yet just trying to get Ford to fix their own defect issues by continuing to contact them.