Could be just the switch (the button you push). To check, pop the center portion of the coin holder between the driver and passenger side seat heater switches. On both opposing short sides of the switch there is a clip that need to be pried open to allow the switch off of the harness.
Just swap the good switch over and if it works, order a new switch.
What heat r u referring to, is it the seat heater. If it is, turn off the seat heater
Yes
Under the hood on the top driver side.
To the left of the driver seat on the floor.
Under the driver seat it is also linked to the reversing sensors
Remove the nuts! They are on the lower metal frame the seat
Sure.Just reinstall the seat belt on back.
under the driver seat, in the undercarriage, And one on the Sump in the tank.
I believe it is under the driver seat. Do you have an LSE?
All Volvo cars have seat belt. Volvo invented the three point seat belt and has used it ever since.
To replace the driver's seat in a 1990 Volvo 240 DL, first, remove the seat by disconnecting the battery and unbolting the seat from the floor using a socket wrench. Carefully pull the seat forward to access the wiring for the seat heaters or any electronic connections, and disconnect them. Next, position the new seat in place, reconnect any wiring, and secure it by bolting it down to the floor. Finally, reconnect the battery and ensure everything is functioning properly.
To remove the driver seat from a 1996 Volvo 960, first disconnect the car battery to avoid any electrical issues. Then, slide the seat all the way forward to access the rear mounting bolts, and use a socket wrench to remove them. Next, slide the seat back to access the front bolts and remove those as well. Finally, unplug any electrical connectors underneath the seat, and carefully lift the seat out of the car.