If you have a sunroof that could be the problem. Check the drains.
〉 Answered on Apr 3rd, 2014 by Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube
It is possible one of the drains is clogged from the HVAC box, the windshield cowl, or the sunroof (if equipped), causing water to end up inside the vehicle. It could also be from the seal around the windshield or doors. If you spray the vehicle with a hose, can you see water coming in?
〉 Answered on Apr 3rd, 2014 by Helaine Kurot, Owner/Technician at 360 Automotive