Brooklyn's a good place! My family has history there.

I rebuilt my drivers seat, removing from the car 3 times, each time fixing the next items I found that needed help.

You can see a misaligned seat back when you look at the seat from outside your car.

Slide or tilt the seat back so top of seat back is now behind the window center post. Look straight through car from the side. If you sight along the headrest sides, the line of sight should line up at the window on the other side of the car. In other words, if seat back is 2" behind center post on the drivers side, it should also be 2" behind center post on the passenger side. If seat back is crooked, you will look straight across the headrest from a place 2" behind the left window post, and your line of sight will hit the right center post, or worse, you will be looking out the right side FRONT window! Cure for this is in #2 below.

1) My back foam was cut in several places. It rests against the frame. When you sit against ait, it cuts through. Mine is an '89; I'd expect your '90 to be cut through also - unless it was rarely used! Takes many hours of sitting for this to happen, of course. It seems that some years Volvo received better foam than other years. The tips I found on gluing with a cloth backing worked out well.

2) Seat Back Misaligned: Bolts attaching back to bottom were slightly loose. They are on the seat bottom. Don't just tighten. There is some play between the bolt holes and the bolt. Seat can angle slightly forward on left side and slightly back on the right side, and then the seat back is crooked.

My method:
- Loosen all 4 of these bolts just slightly.
- If seat angle has been adjusted so seat back is flat
[parallel to bottom], tilt it back up to more "normal" position.
- Press the base and back away from each other, centering your force between left and right so that both sides lean back equally. Tighten bolts while pressing. To do this, I adjusted to a wide "V", turned seat upside down so top of back and front edge of seat are resting on floor (street, in Brooklyn). Press apart on those outer edges, then down at the center part to keep them apart.
- You can prove to yourself that this is important, because you can press one way on left side and the other way on right side and then tighten the bolts, you will then find that your seat back is crooked!.

To thest that it's good, lay a 2x4 on a flat floor (or the best you can find on a Brooklyn street) and set the seat on it in a normal sitting position. 2x4 goes at the rear to keep the bent rail ends off the floor. Sit and try it. Look at the seat back and see how it looks. You can see an angled frame this way.

Good Luck!