So my '00 TL is leaking from about half way down the A pillar on both the driver and passenger side. My sunroof shade is open all the way. Anyone have an idea as to what could be causing this? Thanks in advance!

 

I had a similar leak on the drivers side whenever it rained. Top corner of windshield and would get the top corner of headliner and pillar wet. I bought some polyurethane and put some in under the molding at the corner of the windshield. I am not sure if the windshield had been replaced once by the original owner and the seal at the corner was not done well or whatnot but the poly fixed my leak

 

Your sunroof drain tubes are blocked, Open the sunroof and inspect both passenger and driver side they might be plugged up not letting water drain.

 

Funny you mention the headliner, mine will do the same if the sunroof shade is closed. I'll try the polyurethane thanks!

 

I don't recall what brand I used but I think I bought it at Home Depot. This looks like the proper stuff too
http://www.ebay.com/itm/like/171337948085?lpid=82I thought at first it may be my roof drains but where my headliner was wet I don't think it would have been possible to be the sunroof drain. But you can check the drains and see if they are clear with some thin wire