Vehicle Fluids

Coolant (for example washer fluid hose and heater core in the vehicle interior)
Windshield washer fluid (for example hose -1- from the reservoir to the rear window washer system)

Fig 1: Washer Fluid Hose Routing
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Condensation water from the evaporator (for example water drain -1- from the evaporator is blocked)

Fig 2: Heater Core Location
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.