Section 12-00: Climate Control System, Service
1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual
DIAGNOSIS AND TESTING

Electrical Schematics



Heater System Electrical Schematic






A/C-Heater System Electrical Schematic — Gasoline Engines






A/C Heater System Electrical Schematic 7.3L Diesel






A/C-Heater Control Assembly Connector






Pin NumberCircuitCircuit Function
1348 (P)A/C Demand Signal
2399 (BR/Y)Heater Blower Motor Switch Feed
3182 (BR/W)Thermostat Switch Feed
4181 (BR/O)Blower Motor Feed



A/C Cycling Switch Connector






Heater Blower Motor Connector






A/C Pressure Cut-Off Switch Connector






Pin NumberCircuitCircuit Function
1—Not Used
2441 (R/Y)A/C Pressure Switch to A/C Cycling Switch
3—Not Used
4198 (DG/O)A/C Pressure Switch to Control Relay



Heater Blower Motor Switch Resistor Connector






Heater Blower Motor Switch Connector, F-Series and Bronco






Pin NumberCircuitCircuit Function
157 (BK)Ground Circuit
2261 (O/BK)Blower Motor to Switch — High
3754 (LG/W)Blower Motor Speed Controller to Resistor 1 — Med/Low
4752 (Y/R)Blower Motor Speed Controller to Resistor 2 — Med/High



Blower Motor Circuit, F-53 Motorhome Chassis






A/C Circuit, F-53 Motorhome Chassis