What color vacuum line goes to the panel door vacuum motor?

The blue vacuum line runs from the A/C-heater function selector vacuum valve to the panel door vacuum motor.

Where does the HVAC system get its vacuum supply?

Vacuum comes from a manifold fitting through a vacuum check valve to a vacuum tank, then via black hoses through the HVCB (harness vacuum connection block) and FCCB (function control connection block) to the function selector vacuum valve.

What do V, NV, and PV mean on the diagram?

Per the legend: V = Vacuum, NV = No Vacuum, PV = Partial Vacuum, indicating door positions under those vacuum states.

Which vacuum lines control the floor-defrost door?

The red and yellow lines from the selector valve go to the floor-defrost door vacuum motor, with red connecting at port A/B on the motor.

How is the temperature blend door operated?

The temperature blend door is cable controlled (not vacuum operated), driven by the temperature control lever.

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Ford Bronco A/C-Heater Vacuum Diagram - HVAC Vacuum Line Routing & Door Motors

Ford A/C heater vacuum control schematic with function selector, door motors and hose color routing

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A/C-heater vacuum control diagram showing vacuum tank, check valve, function selector valve, and color-coded hoses to floor-defrost, recirculate and outside-air door vacuum motors.

AI caption October 2015 · Photo 112 of 561

This document is a vacuum routing diagram for a Ford A/C-heater (HVAC) system, uploaded to the gallery of a 1995 Ford Bronco. It shows the vacuum supply path from the intake manifold fitting through a vacuum check valve to a vacuum tank, then via black hoses to the HVCB (Harness Vacuum Connection Block) and FCCB (Function Control Connection Block) feeding the A/C-heater function selector vacuum valve. The selector valve schematic shows internal porting for the OFF, VENT, FLOOR, NORM, MIX, MAX, and DEFROST positions. Color-coded vacuum lines run from the valve: red to the floor-defrost door vacuum motor (ports A and B), yellow also to that motor, blue to the panel door vacuum motor, and white (through FCCB/HVCB) to the outside/recirculate door vacuum motor. A pictorial view of the HVAC housing identifies the heater core, evaporator core, blower motor and wheel, suction accumulator/dryer connection, temperature control lever, temperature blend door (cable controlled), floor-defrost door, panel door, outside/recirc air door, and airflow paths to defrosters, demisters, floor outlets, and instrument panel registers. A legend defines V (vacuum), NV (no vacuum), and PV (partial vacuum) door position states.

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Frequently asked questions

What color vacuum line goes to the panel door vacuum motor?: The blue vacuum line runs from the A/C-heater function selector vacuum valve to the panel door vacuum motor.
Where does the HVAC system get its vacuum supply?: Vacuum comes from a manifold fitting through a vacuum check valve to a vacuum tank, then via black hoses through the HVCB (harness vacuum connection block) and FCCB (function control connection block) to the function selector vacuum valve.
What do V, NV, and PV mean on the diagram?: Per the legend: V = Vacuum, NV = No Vacuum, PV = Partial Vacuum, indicating door positions under those vacuum states.
Which vacuum lines control the floor-defrost door?: The red and yellow lines from the selector valve go to the floor-defrost door vacuum motor, with red connecting at port A/B on the motor.
How is the temperature blend door operated?: The temperature blend door is cable controlled (not vacuum operated), driven by the temperature control lever.