What does it indicate if clear water drips onto the passenger side floor during turns?

When clear water drips onto the passenger side floor during turns, it most likely indicates a clogged evaporator drain. The evaporator core is part of the vehicle’s air conditioning system, where humidity is removed from the air as it passes over the cold evaporator coils. As the air gets cooled, condensation forms and collects, draining out of the system through a drain tube.

If this drain becomes clogged, the accumulated water will not be able to escape and will start to overflow, eventually making its way into the passenger compartment, especially noticeable during turns when the vehicle's angle can cause the water to flow towards the interior. This scenario is distinct from other options, such as a leaking windshield, which would typically involve water from rain or external sources, and a leaking heater core or faulty air conditioning system, where the presence of coolant or other symptoms would be evident. Thus, the occurrence of clear water in this context strongly suggests a blockage in the evaporator drain.