Why does water leak on the passenger side of cab on 2002 dodge Dakota?

Answer 1

If the water is leaking out underneath the cab onto the ground, this is normal if the air conditioner has been, or is being, used. It's just condensation that builds up in the system draining out.

If the water is leaking inside the cab onto the passenger floor, it could be a few things. Compare patterns of air conditioner use to weather and water exposures from washing or sprinklers to indicate the source of the leak.

It is likely that it is, again, condensation from the air conditioner, however, this is not normal and can create problems such as mold growth, foul smells, and rusting. What's happened is that the drain for that condensation to the outside has become plugged, so the water builds up and leaks inside. This problem should be addressed, unfortunately, I'm not aware of any reliable DIY remedies beyond dismantling the heater coil/evaporator coil housing and clearing the blockage. (A fairly big, time consuming job, which may best be left to professionals such as a radiator shop or your mechanic.)

Alternatively, clear water could also be coming in from a leaking door or windshield seal.

Also alternatively, if the liquid is engine coolant, it indicates a leaking heater coil, and needs to be repaired immediately.