Car bmw has a air rushing sound near the back seat near the left tire.?

I have a 1984 bmw 318i. Works great. But there air escaping sound or rushing sound coming from the back seat in the cabin near the right rear tire. It does it at like 10-15 miles and hour and up. With the engine on and off. The car is steady and there no ugly sound while turning. Just the rushing sound. Sound changes as the speed increases. But at 80 miles still steady. Could it be the tire making that sound?Car bmw has a air rushing sound near the back seat near the left tire.?SOUNDS LIKE A BAD DOOR SEAL OR TRUNK SEAL OR THOSE PARTS NOT CLOSING PROPERLY, take a piece of paper and close it in the joint, try to pull it out, if it comes out without resistance you know where the problem liesCar bmw has a air rushing sound near the back seat near the left tire.?Maybe the shock absorbers.Car bmw has a air rushing sound near the back seat near the left tire.?Check the rubber door seal if it has a piece missing it would make that soundCar bmw has a air rushing sound near the back seat near the left tire.?
take the back seat out and look all around the rear wheelwell for sealer missing between the inner wheelwell and the trunk, sounds like air is coming into the car from that area.