water on floor

i have a 2000 grandprix gt .the problem is when it rains i get water on passenger floorboard ????? any one help on this problem? where is the water coming in at? thx

Easy fix! Remove the wiper arms and remove the cowling just below the wipers. On the passenger side there is a rubber channel that is used to direct water away from the heater box. It probably came loose. If it is damaged you may want to replace it with a new one. Use some glue to make sure it stays in place and push it back onto the metal. Make sure the end of the channel is directed into the opening away from the heater box before gluing. Then replace the cowling and wipers and the problem should go away.