HVAC System - Control Components: Overhaul Ford Econoline E150

Climate Control Assembly

The climate control assembly has three system controls

1. The function selector switch combines a vacuum selector valve with two electrical switches to supply battery positive voltage to the A/C clutch circuit (if equipped with A/C) and the blower motor control circuit.
2. The temperature selection is accomplished with a potentiometer connected to the electric temperature blend door actuator that controls positioning of the temperature blend door. Movement of the control knob (18519) from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
3. The blower motor switch controls blower motor speed by adding or bypassing resistors in the heater blower motor switch resistor (18591).

Scheme 21

The blower motor resistor has the following features

1. The assembly is located on the passenger side of the vehicle on the evaporator housing.
2. Three resistance elements are mounted on the resistor board to provide four blower motor speeds.
3. Depending on the blower switch position, series resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
4. An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121 °C (250°F) interrupting the blower motor operation in all speeds except HI.
5. The thermal limiter cannot be reset and is not serviceable.

Refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION .

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1. Remove the headlamp switch knob. Remove the headlamp switch knob. Rotate the headlamps switch bezel counterclockwise and remove.
2. Remove the audio unit. For additional information, refer to «AUDIO UNIT»(ref-210184) .
3. Remove the instrument panel finish panel. Remove the screws. Remove the instrument panel finish panel. Disconnect the electrical connectors.
4. Remove the climate control assembly. Remove the screws. Remove the climate control assembly.
5. Disconnect the vacuum and electrical connectors.
6. Remove the climate control assembly.
7. To install, reverse the removal procedure.

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1. Remove the climate control assembly. For additional information, refer to «CLIMATE CONTROL ASSEMBLY»(ref-210173-S08901827532005121400000) .
2. Remove the climate control switch knobs.
3. Remove the A/C-heater function selector switch. Remove the screw. Remove the A/C-heater function selector switch.
4. Remove the temperature control switch. Remove the screw. Remove the temperature control switch.
5. Remove the heater blower motor switch (18578). Remove the screw. Remove the heater blower motor switch.
6. To install, reverse the removal procedure.

Scheme 29

1. Remove the temperature blend door actuator (19E616). Disconnect the temperature blend door actuator connector. Remove the four screws. Remove the temperature blend door actuator.
2. To install, reverse the removal procedure.

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1. Disconnect the battery (10655). For additional information, refer to «BATTERY, MOUNTING AND CABLES»(ref-210181) .
2. Remove the battery.
3. Remove the battery tray. Remove the screws. Remove the battery tray.
4. Disconnect the blower motor resistor electrical connector.
5. Remove the blower motor resistor (18591). Remove the two screws. Remove the blower motor resistor.
6. To install, reverse the removal procedure.

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1. Remove the access panel. Use a screwdriver to pry the access panel out.
2. Remove the vacuum lines.
3. Remove the two screws.
4. Remove the vacuum control motor (18A318). Lift up on the vacuum control motor arm to disengage it from the door crank. Remove the vacuum control motor.
5. To install, reverse the removal procedure.

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1. Remove the access panel. Use a screwdriver to pry the access panel out.
2. Remove the vacuum line.
3. Remove the two screws.
4. Remove the vacuum control motor (18A318). Lift up on the vacuum control motor arm to disengage it from the door crank. Remove the vacuum control motor.
5. To install, reverse the removal procedure.

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1. Remove the instrument panel finish panel.
2. Remove the bolts and the instrument panel reinforcement.
3. Remove the bolts and the instrument panel reinforcement bracket.
4. Remove the vacuum line.
5. Remove the two screws.
6. Remove the vacuum control motor (18A318). Lift the vacuum control motor arm off of the door crank. Remove the vacuum control motor.
7. To install, reverse the removal procedure.

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1. Remove the evaporator core housing assembly. For additional information, refer to «HEATING & VENTILATION»(ref-210170) .
2. Remove the vacuum reservoir tank. Remove the screw. Drill out the heat stake. Remove the vacuum reservoir tank.
3. Disconnect the vacuum harness.