Section 12-03A: Air Conditioning System, Manual A/C-Heater | 1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual |
A heater blower motor switch resistor (18591) with a thermal limiter is mounted in the engine compartment. The heater blower motor switch resistor is used with the heater blower motor switch (18578) to obtain the desired fan speed.
Blower Motor Thermal Limiter
The thermal limiter in the heater blower motor switch resistor serves as a temperature sensitive fuse. When the thermal limiter is opened, the heater blower motor switch resistor must be replaced.