There were no extraneous variables leading to the rear window explosion. the police were not able to find any contact entry or evidence of vandalism and indicated it was possibly defective glass. dealership indicated that they would not investigate the possibility of previous stress cracks or design defects, although they admitted that this class of vehicle has severe internal pressure fluctuations while a rear passenger window is open traveling at highway speeds, and this was experienced the day before. the glass shattered while the car was parked, with the temperature being between 65 & 70f, with nobody in it. there were no prior issues with the glass. the only issue with the vehicle prior to the glass was the pressure fluctuations. *tr