guys I have a 1999 civic ex 2drs, and everytime it rains the trunk gets wet it only happens in the driver side, the gasket is fine and old but is coming from somewhere else, any ideas???

 

run water over the car and try to locate where it is coming from.

 

I have the same problem on my 99 civic (4dr) and this is where its coming in

 

also check the air outlet thats where i just fixed a leak on my 2dr. its on the drivers side on the left you have to take off the bumper to see it or take off the trunk lining. but you can only get it out by taking the bumper off.

 

silicone it under the seal

 

+1... Also, inspect if you see any type of moisture near the tail lights. My tail light gaskets for the trunk lights are garbage and leak a little water.

 

Just to ensure the trunk seal is doing well, lubricate the seal with some silicone grease. Then look at the vents in the trunk that are near the bumper area for leakage.

 

A little late but here is another possibility if you have a sunroof....
https://www.hondacivicforum.com/foru...ighlight=trunk

 

I have a 2000 civic 2dr and it leaks in the same spot as the picture posted. I thought it was the tail lights replaced the gaskets and still leaked. I got in the trunk and had a friend run water down the back window and it came in where the metal is joined. I used so seam sealer and the leak went away. Water leaks suck to trace down.

 

thank you everyone