Auxiliary Climate Control: Other Ford Econoline E150

Air Distribution

Vehicles with trim have a vertical duct that supplies air to the integral headliner air conditioning duct. Air is supplied to the passengers through six adjustable registers. The heater floor duct is integral to the side trim panel and has four fixed registers for optimum heater air distribution. The trim panel connects directly to the auxiliary A/C-heater unit.

Vehicles without trim do not have overhead registers, heater floor ducts or registers. A unique A/C register is used to distribute air-conditioned air, and a heater outlet duct assembly distributes heated air.

System Airflow

The function selector switch (located in the front A/C control (19980)) controls the air distribution for both the front and auxiliary systems.

1. The mode door is driven by a vacuum control motor (18A318) to its predetermined position.
2. When the function selector switch is in the FLOOR or MIX position, the auxiliary system will direct air to the floor.
3. When the function selector switch is in the VENT position, the auxiliary system will direct air to the overhead vents.
4. When the function selector switch is in the NORM A/C or MAX A/C position, air-conditioned air is distributed through the A/C registers.
5. The auxiliary system uses only recirculated air from the vehicle interior. Outside air intake is not available.

Blower Motor

The auxiliary climate control assembly contains a blower motor (19805). It is controlled by the heater blower motor switch (18578) on the front climate control assembly.

Heater Core

The auxiliary A/C system uses a rear-mounted heater core (18476) which operates in the same manner as the front mounted heater core. For additional information, refer to HEATING & VENTILATION .

A/C Evaporator Core

The auxiliary A/C system uses a rear-mounted A/C evaporator core (19860) which operates in the same manner as the front mounted A/C evaporator core. For additional information, refer to AIR DISTRIBUTION & FILTERING .

Scheme 17

A thermostatic expansion valve (TXV) (19849) regulates the flow of refrigerant into the auxiliary A/C evaporator core. It is also the dividing point in the system between low- and high-pressure sides.

The temperature sensing bulb measures the temperature of the refrigerant in the suction line and transmits it to the TXV. This temperature variation regulates the refrigerant flow to the auxiliary A/C evaporator core.

1. When the bulb senses a high temperature, the TXV opens and provides refrigerant through the auxiliary A/C evaporator core.
2. When the bulb senses a low temperature, the TXV starts closing to shut off the refrigerant to the auxiliary A/C evaporator core.

Air Conditioning

Refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION .

Thermostatic Expansion Valve

MATERIALS

Scheme 18

1. Remove the A/C evaporator core (19860). For additional information, refer to «EVAPORATOR CORE»(ref-210172-S21264390032005121400000) .
2. Separate the capillary bulb from the outer evaporator outlet tube. Remove the A/C insulating tape and save for reuse. Remove the clip securing the capillary bulb to the tube.
3. Remove the thermostatic expansion valve (TXV) (19849). CAUTION: Use a wrench on each side of the fitting to prevent damage to the A/C fitting. Disconnect the refrigerant lines. Remove the TXV.
4. To install, reverse the removal procedure. Install new O-ring seals lubricated in clean mineral oil.

Scheme 19

Scheme 20

Scheme 21

1. Remove the air conditioning and heater assembly. For additional information, refer to «AIR CONDITIONING AND HEATER ASSEMBLY»(ref-210172-S42528670862005121400000) .
2. Remove the vacuum line.
3. Remove the vacuum control motor (18A318). Remove the screw. Unsnap and remove the vacuum control motor.
4. Disconnect the vent door from the vacuum control motor.