i have a very small water leak on my passenger floor. its really small, and its just a few drops of water that drip from the bottom left corner just under the glove box. it drips down then drips onto the passenger side speaker then onto the plastic side piece.

it only leaks when it rains hard at night. anyone have a problem like this? my windshield has been replaced before. could be that

 

it could be the windshield, but it could also be the a clogged drain from the sunroof if you have one...worst case it is a cracked heater core. your best bet is to get a bucket of water and pore it around where you think the leak could be and check to see if you find any water inside the car.

 

i did a leak test. its leaking from my passenger side drain tube. the water drips down the a pillar and then down by the glove box. i took some rosincore solder and pushed it down the drain tube. then sprayed soapy water down the tube. i then poured water on the sunroof. no leak! for now