What might cause 2017 subaru outback water leak passenger side?

A 2017 Subaru Outback water leak on the passenger side could be caused by a clogged AC drain hose or failing heater core. The evaporator core for Your Subaru AC system is located in the dash on the passenger side, and it will sweat similarly to glass of ice water. There's a drain hose that carries this moisture away, but it can get plugged up. The condensation must go somewhere, so it finds its way to the passenger floor. Finding this drain tube and cleaning it out with compressed air or a length of wire should solve this problem. The heater core is typically located just above the passenger footwell where it circulates hot engine coolant in front of a fan so You get hot air when the heater is turned on. If the heater core or one of its hoses develops a leak, it's likely to puddle up on the passenger floor in the front. If this happens, You'll likely notice a sweet smell from the leaked coolant.