power seats on 1998 Volvo S90

hi my seat were working an then one side on both sides stop sliding up or back just on one side one track works what can this be? Thx

Asked by for the 1998 Volvo S90
I have the same problem on my 98 S90, I found the problem. All the power seat functions are driven by 3-electric motors and flex shafts that drive the functions. What I found was the the shaft that drives to fore-aft motion (there are 2 each drives one side of seat fore-aft) one had twisted the end off. There are a couple of ways to fix this, remove seat and shorten outer casing (depending on where the shaft broke, typically its the end) clean up the end and re-insert this is only a short term fix as the end will twist off again. Other option is to find a used one in a Salvage Yard. I found mine at Chris's Volvos etc... in Maumelle, AR.

There is another option that is to purchase the Seat Mechanism from Dealer for $2,700....

Hope this helps....

FYI the S90 has the same Seats as the Volvo 960
1 more answer
Check for debris in the tracks, and check the switch.