Service Attendant Selling Ford V-8 Heater to Customer, November 1936

Heaters weren't standard equipment on all cars in the 1930s. Ford Motor Company and its dealers sold aftermarket heaters that used engine heat, routed through a heat exchanger, to warm the passenger compartment. Funnel-type heaters simply relied on the engine fan and the car's forward motion to move warm air. Blower-type heaters used electric blowers to help move the air.