LOAD LIMITING SEATBELT RETRACTOR

A vehicle includes a seatbelt retractor. The seatbelt retractor includes a housing. The seatbelt retractor includes a spool having a first end and a second end each rotatably supported by the housing. The spool is elongated on an axis from the first end to the second end. The seatbelt retractor includes a torsion bar having a first end fixed to the first end of the spool and a second end operatively engaged with the housing. The torsion bar has a central cavity. The seatbelt retractor includes a heating filament disposed in the central cavity.