Water is entering through the air vents of my 1992 nissan maxima into the drivers side.?

Question

are air vents blocked

Answer 1

It might be condensation from the air-conditioner.
That would be because the drain-hole is plugged.
And that may be from mould growing in the pan.
Get an A/C service company to check the drainage.

It could also be from rain or the car-wash too.