Several option depending whats wrong... If you don't care about showing the car in Factory class even more.
Resistor itself is still made.
Use later single speed (need the power socket) then wire as 2 speeds or 1 speed.
Some data in my Cave, Rad Fan
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)