[richtazz]

There is a cowl seal under the hood that is a common problem. You'll have to remove the wiper arm and the plastic under it to gain access. The Regal (sister car to the grand Prix) comes factory with a cabin air filter, so ask for one for a similar year Regal. Gm never put one in the Grand Prix, but the spot is there for it. It creates a better cowl seal and helps channel the water away. Plus is keeps dust and pollen out of the pasenger compartment, and foreign material out of the blower motor, extending it's life also.