I have a 91 240 sx that continues to leak water in through the rear hatchback .I have tried to follow the possible entry paths but have not had too much success in stopping the water. If anyone else who owns one of these cars can assist in their ability to correct this. It is much needed information. Thank you.

 

look under the rear of the roof liner
there are two rubber groumets for the rear wiring to go through.
one on each side of the car. check those.

also check that your tail lights are screwed in all the way
pull off all the carpet stuff in there and have some one spray it with water to find the leak