Inside, the heater core and the blower will be replaced ... The only modification you have to make is to fit a modern 12-volt blower motor. The 12-volt motors are bigger than the 6-volt ones ...

Pushing the start button activates a motor controller ... An EV’s 12-volt battery also powers the accessories, lights, wipers, power windows and seats, heater blower fan, modem, airbags and ...