What wire feeds the heater/A-C blower circuit from the fuse panel?

Circuit 181 O comes from fuse panel position F-3, and circuit 137 Y-BK comes from fuse panel position F-12. Circuit 181 O feeds the blower switches through connector C-606.

What are the blower switch positions?

Both the A/C control switch (blower) and the heater blower switch have four positions: 1. OFF, 2. LOW, 3. MED, 4. HI.

What are the mode switch positions shown?

1. OFF, 2. VENT, 3. A/C, 4. HI-LO, 5. HEAT, 6. HEAT-DEFROST, 7. DEFROST.

How does the blower motor ground?

The blower motor grounds through circuit 57 BK to ground point G-601 (via connector C-611 on the heater/A-C circuit and C-605 on the heater-only circuit).

Where is connector C-530 located and what color is it?

C-530 is located behind the instrument panel, near the conventional radio, and the diagram notes that all connectors there are grey. It involves parts 18B821, 18A919, and 18W862.

What wire colors go through the blower motor resistor circuits?

From the blower switch, circuits 268 R-BK, 269 BL-R, and 270 BK-Y run through connector C-604 to the blower motor resistor; 270 BK-Y continues to the blower motor.

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1979 Ford Bronco Heater & A/C Blower Wiring Diagram - Circuits & Connector Pinouts

Ford heater and A/C blower motor wiring diagram with connector pinouts

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Factory wiring diagram for the heater/AC blower-motor circuit: power distribution fuse panels, blower switch positions, blower motor resistors, A/C clutch solenoid, with connector C-590/C-533/C-580 pinout views.

AI caption January 2010 · Photo 28 of 104

This document is a scanned Ford factory-style wiring diagram page covering the heater and air conditioning (A/C) blower circuits. The top schematic traces power from the fuse panel (F-12 via circuit 137 Y-BK, F-3 via circuit 181 O), connector C-503 (297 BK-GR), and connector C-408 (932 BL, carburetor emission control solenoid) through connectors C-606, C-607, C-608, C-609, C-611, C-613, and C-616. It shows two parallel blower circuits — one for 'Heater and A/C' and one for 'Heater Only' — each with a blower switch (positions: Off, Low, Med, Hi), blower motor resistor, blower motor, and ground G-601 via circuit 57 BK. A 7-position mode switch is documented (Off, Vent, A/C, Hi-Lo, Heat, Heat-Defrost, Defrost). The A/C side includes the evaporator thermostat and A/C clutch solenoid (circuits 348 GR-W, 347 BK, 932 BL). Wire circuit numbers and colors are given throughout (e.g., 268 R-BK, 269 BL-R, 270 BK-Y). The lower half provides pinout views of instrument-panel connectors C-530 (parts 18B821, 18A919, 18W862, located behind the instrument panel near the conventional radio, all grey), C-532 (18B919), and C-533, listing each pin's circuit number and wire color.

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Frequently asked questions

What wire feeds the heater/A-C blower circuit from the fuse panel?: Circuit 181 O comes from fuse panel position F-3, and circuit 137 Y-BK comes from fuse panel position F-12. Circuit 181 O feeds the blower switches through connector C-606.
What are the blower switch positions?: Both the A/C control switch (blower) and the heater blower switch have four positions: 1. OFF, 2. LOW, 3. MED, 4. HI.
What are the mode switch positions shown?: 1. OFF, 2. VENT, 3. A/C, 4. HI-LO, 5. HEAT, 6. HEAT-DEFROST, 7. DEFROST.
How does the blower motor ground?: The blower motor grounds through circuit 57 BK to ground point G-601 (via connector C-611 on the heater/A-C circuit and C-605 on the heater-only circuit).
Where is connector C-530 located and what color is it?: C-530 is located behind the instrument panel, near the conventional radio, and the diagram notes that all connectors there are grey. It involves parts 18B821, 18A919, and 18W862.
What wire colors go through the blower motor resistor circuits?: From the blower switch, circuits 268 R-BK, 269 BL-R, and 270 BK-Y run through connector C-604 to the blower motor resistor; 270 BK-Y continues to the blower motor.