I just picked up another GS-R a few weeks ago, and just noticed the rear hatch leaks pretty badly when it rains or i wash the car. The seal looks to be in decent condition but…here are some pics of where the water is coming from. any help would be awesome. what i did was place my hose on top of the car near the rear glass and let it run down the hatch.
Check the sun roof, on my car the corners of the sun roof assembly where the drain tubes get attached was starting to rust and it was letting water leak out. I cut out the rust and reshaped the corners with JB weld.
water was not near the sunroof when i was searching for the leak. i was only letting the water run on the hatch. thanks