I was driving in the rain the other day, and i noticed that the place where the headliner meets the plastic of the A pillar was wet. I dried it with a towel, and it was wet again later. Where is this water coming from, and how do i stop the leak? Is it from the moonroof?

 

yeah its the sunroof, the drain tubes are clogged. using a compressor and a blow nozzle, open the roof and blow air into the front drain tubes in each front corner. if you dont have access to a compressor pull off the front sill plates, than pull off the kick panel covers and reach in the hole and pull out the drain tubes and clean them out using a pencil or something.

 

Ok so I tried a compressor but that didn't seem to do anything (crappy compressor) and then i took a coat hanger and stuffed it down the hole (front left one) and it seemed to push some debris out of the way. But, i poured some water down the hole and it still leaks! What else can I try? How do I pull off the front sill plates, and pull off the kick panel covers?

 

that means the tube got a hole in it. the tube runs down the pillars on both side.

 

get your fingers underneath the sill plate on the carpet side and carefully pull up, start at one end and work your way to the other. than the kick panel pull straight out towards the center of the car. there might be a relay on a bracket in front of the hole in the kick, i dont remember, if so 10mm to take it out or just bend it up than you can reach in and pull out the drain tube. it is unlikely that there is a hole in the tube somewhere unleses you accidentally punctured it with the coat hanger.