Poorly! There's a heat element next to the bimetallic spring in the choke thermostat (the little metal box perched atop the exhaust manifold). The heater is powered via another little box perched atop the cylinder head; this second box's job is to control electric power to the heater. The heater's job is to cause the choke to open sooner than later, so the cars would pass their new-vehicle emissions type-approval tests and Chrysler could legally offer them for sale. Unlike the '72-down chokes without the heat element, these '73-up items are nonadjustable. They are also notorious for opening too fast/too soon and causing gasp/stall/hesitate driveability faults. Do yourself a giant favour; fetch a № 1234 SuperChoke kit and drop it in place of the factory equipment. They work much better and they're fully adjustable.
