It's happened twice since I've owned car - a few times in the last couple of months.

Both seat belts for 3rd seat won't pull out - both times it happened after parking on a hill. And both times it was fine once I parked on the level.

IE tonight I could belt the kids in while parked on the hill. Went one mile down the road to get gas and they both worked..?

Anyone experience this?

EDIT: From FAQ, it sounds like the angle is important so a hill seems as though it could make it lock.

[emphasis added]

Seat Belt Retraction Reset. [Query] I removed the front passenger seat. When I was ready to reinstall the seat belt reel unit located on the bottom of the seat it wouldnt give me any slack. I could feed it more belt but it wouldn't give any back. After playing with it for too long I decided that I would just get a different seat belt from the junkyard. As soon as I removed the belt off another 740 it did the same thing. Is there any kind of reset? [Response: Don foster] You must hold the spool in exactly the same orientation as when it's mounted. Otherwise the internal latch locks it up. It can be a royal pita. [Response: Art Benstein] Hold the retractor perfectly level and steady while you pull out the belt. The spool locks when a weight senses inertial change. [Response: John Randstrom] You must duplicate the angle that the seat belt assembly is mounted to the seat frame before the belt will unspool. I took me quite a few positions before it freed up. After this experience I always pull out some slack and put a large safety pin through the webbing that prevents the excess from being drawn into the belt assembly before unbolting it from the seat.

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Norm Cook; Vancouver BC; 1989 745T 210,000KM