HVAC Auxiliary Control System Ford Taurus X I

Material

Material

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Auxiliary Climate Control System

The auxiliary climate control housing is located on the LH side of the vehicle between the side windows and the floorpan, behind the rear wheel well. The driver has primary control of the auxiliary climate control system or can transfer control to the auxiliary climate control assembly.

All of the auxiliary climate control system components are serviceable from the inside of the vehicle except the lines.

Auxiliary System Air Distribution

A vertical air distribution duct supplies air to the integral headliner air distribution duct. Airflow is then directed to the passengers through adjustable registers. The heater floor duct supplies air to a fixed register, which is integral to the side trim panel.

Scheme 173

The auxiliary climate control system has the following features

1. The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary climate control system.
2. Air is cooled and dehumidified by the auxiliary evaporator core only if the main HVAC module is adjusted to a position that requires A/C compressor operation.
3. The temperature blend door and the airflow mode door are controlled by electric actuator motors.
4. Movement of the auxiliary temperature/mode control between COOL/ROOF and WARM/FLOOR causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core and also causes a corresponding movement of the mode door to the ROOF and FLOOR positions.

Blower Motor

The auxiliary climate control system contains a blower motor, which is controlled by the HVAC module or rear auxiliary climate control assembly.

Auxiliary Climate Control Assembly

The auxiliary climate control system has dual controls for the driver and rear passengers consisting of temperature/air distribution and blower speed. The front auxiliary climate controls are built into the HVAC module. The rear auxiliary climate control assembly is mounted in a separate overhead console positioned on the headliner above the 2nd row seating area.

Evaporator Core

The auxiliary climate control system uses an evaporator core, which cools and dehumidifies the airflow from the auxiliary blower motor when the A/C compressor is operating. All airflow from the blower motor passes through the evaporator core.

Heater Core

The heater core consists of fins and tubes arranged to extract heat from the engine coolant and transfer it to air passing through the heater core.

Thermostatic Expansion Valve

The thermostatic expansion valve (TXV) is located behind the LH rear quarter trim panel at the auxiliary evaporator inlet and outlet. The TXV provides a restriction to the flow of refrigerant from the high-pressure side of the refrigerant system and separates the low-pressure and high-pressure sides of the refrigerant system. Refrigerant entering and exiting the evaporator core passes through the TXV through 2 separate flow paths. An internal temperature sensing bulb senses the temperature of the refrigerant flowing out of the evaporator core and adjusts an internal pin-type valve to meter the refrigerant flow into the evaporator core. The internal pin-type valve decreases the amount of refrigerant entering the evaporator core at lower temperatures and increases the amount of refrigerant entering the evaporator core at higher temperatures.

Underbody Auxiliary A/C Lines

The underbody auxiliary A/C lines carry refrigerant to the auxiliary A/C evaporator inlet, and away from the auxiliary A/C evaporator outlet. The auxiliary underbody lines have the following characteristics

1. The auxiliary evaporator inlet line carries high-pressure refrigerant liquid from the TXV manifold and tube assembly to the auxiliary evaporator.
2. The auxiliary evaporator outlet line carries refrigerant vapor from the auxiliary evaporator to the TXV manifold and tube assembly.

Underbody Heater Lines

The underbody auxiliary heater lines have the following features

1. The underbody auxiliary heater inlet line is a aluminum tube assembly that carries coolant from the engine coolant supply line to the auxiliary heater core inlet.
2. The underbody auxiliary heater outlet line carries coolant from the auxiliary heater core to the front heater core outlet line.

Scheme 174

REMOVAL AND INSTALLATION

All vehicles

1. Remove the LH quarter trim panel. For additional information, refer to «INTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) article.
2. Disconnect the power liftgate (PLG) module electrical connector.
3. Remove the PLG module bolt. To install, tighten to 9 Nm (80 lb-in).
4. Remove the PLG module and bracket.
5. Disconnect the auxiliary blower motor electrical connector.
6. Remove the 3 auxiliary blower motor screws.
7. Remove the auxiliary blower motor.
8. Remove the auxiliary blower motor wheel clip.
9. Remove the auxiliary blower motor wheel.
10. To install, reverse the removal procedure.

Scheme 175

1. Remove the LH quarter trim panel. For additional information, refer to «INTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) article.
2. Disconnect the auxiliary blower motor resistor electrical connector.
3. Remove the 2 auxiliary blower motor resistor screws.
4. Remove the auxiliary blower motor resistor.
5. To install, reverse the removal procedure.

Auxiliary Climate Control Housing

Material

Scheme 176

Scheme 177

All vehicles

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/taurus-x/i-2007-2009/remont/hoistjack/#jacking-and-lifting) article.
2. Recover the refrigerant. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.
3. Remove the LH quarter trim panel. For additional information, refer to «INTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) article.
4. Drain the engine coolant. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
5. Remove the LH rear wheel and tire assembly.
6. Remove the LH rear wheel opening splash shield.
7. Release the auxiliary heater inlet hose clamp and disconnect the auxiliary heater inlet hose.
8. Release the auxiliary heater outlet hose clamp and disconnect the auxiliary heater outlet hose.
9. Remove the auxiliary evaporator outlet line fitting nut and disconnect the fitting. To install, tighten to 8 Nm (71 lb-in).
10. Remove the auxiliary evaporator inlet line fitting nut and disconnect the fitting. To install, tighten to 8 Nm (71 lb-in).
11. Remove the 2 floorpan bracket nuts. To install, tighten to 3 Nm (27 lb-in).
12. Disconnect the power liftgate (PLG) module electrical connector.
13. Remove the PLG module bolt. To install, tighten to 9 Nm (80 lb-in).
14. Remove the PLG module and bracket.
15. Remove the 2 auxiliary duct pin-type retainers and detach the auxiliary ducts.
16. Disconnect the 2 auxiliary climate control housing electrical connectors.
17. Detach the auxiliary blower motor relay pin-type retainer(s).
18. Remove the 3 auxiliary climate control housing bolts. To install, tighten to 6 Nm (53 lb-in).
19. Remove the auxiliary climate control housing.
20. To install, reverse the removal procedure. Install new O-ring seals. Lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.
21. Fill the engine coolant. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
22. Evacuate, leak test and charge the refrigerant system. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.

Auxiliary Evaporator Outlet and Inlet Line

Material

Scheme 178

Scheme 179

Scheme 180

Scheme 181

1. 1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/taurus-x/i-2007-2009/remont/hoistjack/#jacking-and-lifting) article.
2. Recover the refrigerant. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.
3. Drain the engine coolant. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
4. Remove the rear subframe. For additional information, refer to «UNI-BODY, SUBFRAME AND MOUNTING SYSTEM»(/ford/taurus-x/i-2007-2009/remont/frames-subframes-crossmembers/#uni-body-system-subframe-system-and-mounting-system) article.
5. Remove the front auxiliary evaporator inlet line fitting nut and disconnect the fitting. Discard the O-ring seal and gasket seal. To install, tighten to 15 Nm (11 lb-ft).
6. Remove the front auxiliary evaporator outlet line fitting nut and disconnect the fitting. Discard the O-ring seal and gasket seal. To install, tighten to 15 Nm (11 lb-ft).
7. Release the 2 front auxiliary heater line heater hose clamps and disconnect the hoses.
8. Remove the LH rear quarter panel molding. For additional information, refer to «EXTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#exterior-trim-and-ornamentation) article.
9. Remove the 3 outer LH rear quarter panel molding bracket bolts.
10. Remove the 2 inner LH rear quarter panel molding bracket bolts.
11. Remove the LH rear quarter panel molding bracket. Detach the splash shield pin-type retainer.
12. Release the 2 rear auxiliary heater line heater hose clamps and disconnect the heater hoses.
13. Remove the rear auxiliary evaporator inlet line fitting nut and disconnect the fitting. Discard the O-ring seal. To install, tighten to 8 Nm (71 lb-in).
14. Remove the rear auxiliary evaporator outlet line fitting nut and disconnect the fitting. Discard the O-ring seal. To install, tighten to 8 Nm (71 lb-in).
15. Correctly support the fuel tank and remove the LH fuel tank strap bolt. To install, tighten to 35 Nm (26 lb-ft).
16. Position the LH fuel tank strap aside.
17. Remove the front and rear auxiliary line bracket nuts. To install, tighten to 5 Nm (44 lb-in).
18. Remove the 4 auxiliary line bracket bolts and remove the auxiliary evaporator and heater line bundle as an assembly. To install, tighten to 5 Nm (44 lb-in).
19. Detach the auxiliary evaporator line(s) from the auxiliary line brackets as needed.
20. To install, reverse the removal procedure. Install new gasket seals and O-ring seals. Lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.
21. Fill the engine coolant level. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
22. Evacuate, leak test and charge the refrigerant system. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.

Scheme 182

1. Remove the LH quarter trim panel. For additional information, refer to «INTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) article.
2. Remove the 9 auxiliary heater core cover screws.
3. Drain the engine coolant. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
4. Release the auxiliary heater core inlet hose clamp and disconnect the hose.
5. Release the auxiliary heater core outlet hose clamp and disconnect the hose.
6. Remove the auxiliary heater core.
7. To install, reverse the removal procedure.
8. Fill the engine cooling system. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.

Auxiliary Heater Outlet and Inlet Line

Material

Scheme 183

1. 1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/taurus-x/i-2007-2009/remont/hoistjack/#jacking-and-lifting) article.
2. Recover the refrigerant. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.
3. Drain the engine coolant. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
4. Remove the rear subframe. For additional information, refer to «UNI-BODY, SUBFRAME AND MOUNTING SYSTEM»(/ford/taurus-x/i-2007-2009/remont/frames-subframes-crossmembers/#uni-body-system-subframe-system-and-mounting-system) article.
5. Remove the front auxiliary evaporator inlet line fitting nut and disconnect the fitting. Discard the O-ring seal and gasket seal. To install, tighten to 15 Nm (11 lb-ft).
6. Remove the front auxiliary evaporator outlet line fitting nut and disconnect the fitting. Discard the O-ring seal and gasket seal. To install, tighten to 15 Nm (11 lb-ft).
7. Release the 2 front auxiliary heater line heater hose clamps and disconnect the hoses.
8. Remove the LH rear quarter panel molding. For additional information, refer to «EXTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#exterior-trim-and-ornamentation) article.
9. Remove the 3 outer LH rear quarter panel molding bracket bolts.
10. Remove the 2 inner LH rear quarter panel molding bracket bolts.
11. Remove the LH rear quarter panel molding bracket. Detach the splash shield pin-type retainer.
12. Release the 2 rear auxiliary heater line heater hose clamps and disconnect the heater hoses.
13. Remove the rear auxiliary evaporator inlet line fitting nut and disconnect the fitting. Discard the O-ring seal. To install, tighten to 8 Nm (71 lb-in).
14. Remove the rear auxiliary evaporator outlet line fitting nut and disconnect the fitting. Discard the O-ring seal. To install, tighten to 8 Nm (71 lb-in).
15. Correctly support the fuel tank and remove the LH fuel tank strap bolt. To install, tighten to 35 Nm (26 lb-ft).
16. Position the LH fuel tank strap aside.
17. Remove the front and rear auxiliary line bracket nuts. To install, tighten to 5 Nm (44 lb-in).
18. Remove the 4 auxiliary line bracket bolts and remove the auxiliary evaporator and heater line bundle as an assembly. To install, tighten to 5 Nm (44 lb-in).
19. Detach the auxiliary heater line(s) from the auxiliary line brackets as needed.
20. To install, reverse the removal procedure. Install new gasket seals and O-ring seals. Lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.
21. Fill the engine coolant level. For additional information, refer to «ENGINE COOLING»(/ford/taurus-x/i-2007-2009/remont/cooling-system-mechanical/#engine-cooling-system) article.
22. Evacuate, leak test and charge the refrigerant system. For additional information, refer to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics) article.

Scheme 184

1. Remove the LH quarter trim panel. For additional information, refer to «INTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) article.
2. Disconnect the auxiliary mode door actuator electrical connector.
3. Remove the 2 auxiliary mode door actuator screws.
4. Remove the auxiliary mode door actuator.
5. To install, reverse the removal procedure.

Scheme 185

1. Remove the LH quarter trim panel. For additional information, refer to «INTERIOR TRIM AND ORNAMENTATION»(/ford/taurus-x/i-2007-2009/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) article.
2. Disconnect the auxiliary temperature blend door actuator electrical connector.
3. Remove the 3 auxiliary temperature blend door actuator screws.
4. Remove the auxiliary temperature blend door actuator.
5. To install, reverse the removal procedure.

See also:
• INTERIOR TRIM AND ORNAMENTATION
• JACKING AND LIFTING
• CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS
• ENGINE COOLING
• UNI-BODY, SUBFRAME AND MOUNTING SYSTEM
• EXTERIOR TRIM AND ORNAMENTATION