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I have the same problem on my '88 and I understand that most seats of this vintage have split on the right side back. Last week I took the seat out and tried a repair. Of course time will tell if my repair will work but it cost only my efforts and $7.95 USD insted of $158 plus SH for a new foam back. If you want to try it, here's what I did:
1. Removed seat (don't forget to unplug the seat heater connection underneath first!)
2. Removed the hog rings holding the seat back upholstery.
3. Unscrewed the lumbar support adjustment knob on the side and removed it and the plastic part under it.
4. Peeled the upholstery upward like taking off your shirt. It will be held at the top by the headrest.
5. Now you see the mysterious headrest release meachanism that nealy all Volvo owners have wondered about at some time. Release and pull out the headrest so you can remove the upholstery.
6. Carefully removed the foam from the seatback framework. Don't lose the thin fabric material on the top, it helps the upholstery to slide back down over the foam when you're done.
7. I sprayed a foam adhesive into the split and held the split together until the adhesive set. Then, using the adhesive, I reinforced both sides of the seat with 24 oz canvas strips on the inside of the groove where the split was and on the outside of the foam. I also covered all sharp edges with duct tape.
8. Fix the seat heaters at this time if they are on the blink, mine needed this.
9. Check the seat frame to see if it has been bent. Mine was a little and I could straigten it by hand, wonder how long that will last.
10. Put it all back together but used plastic zip-ties instead of hog rings. (MUCH easier to work with, got the idea from the Brickboard)
Now My repair is new so we'll have to see if it works but the seat feels much better.
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