Ive had one of the crappest (fooked 1600 Mk1 sierra), one of the best (the mad 3dr cossie), and one in between (a moonstone 2.8V6 Janspeed Turbo 3door cossie rep with external wastegate etc), and NONE of them pissed water thru the vents when raining.

And knowing the routing for the blower pipes in the heater system, im suprised waters coming out, or do u mean the ones by ur feet?