SECTION
MAINTENANCE AND REPAIR
ON-VEHICLE SERVICE
GENERAL A/C SYSTEM SERVICE PROCEDURES
General Service Procedures
- Discharging, Adding Oil, Evacuating, and Charging Procedures for A/C System.
- Handling of Refrigerant Lines and Fittings.
- Handling Refrigerant.
- Maintaining Chemical Stability in the Refrigeration System.
- O-Ring Replacement.
SERVICEABLE COMPONENTS
Common HVAC Components
Those components used in non-automatic systems are covered in other sections of this manual.
- Blower Motor.
- Heater Hoses.
-
- Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System, for the following procedures:
- A/C Pressure Transducer.
- Compressor-to-Condenser Hose.
- Compressor.
- Condenser.
- Evaporator-to-Compressor Pipe.
- Evaporator-to-Receiver-Dryer Pipe.
- Receiver-Dryer.


Automatic Temperature Control Assembly
Removal Procedure
- Disconnect the negative battery cable.
- Remove the audio trim panel. Refer to Section 9F, Audio Systems.
- Remove the control assembly retaining screws.
- Pull out the unit to gain access to the rear.
- Disconnect the electrical connectors.
- Remove the air inlet tube.
- Remove the automatic temperature control assembly.


Installation Procedure
- Connect the air inlet tube.
- Connect the electrical connectors.
- Position the automatic temperature control assembly and install the retaining screws.
Tighten
Tighten the control assembly retaining screws to 2.5 N•m (22 lb-in).
- Install the audio trim panel. Refer to Section 9F, Audio Systems.
- Connect the negative battery cable.


Inlet Air Door Motor
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Disconnect the negative battery cable.
- Remove the glove box. Refer to Section 9E, Instrumentation/Driver Information.
- Remove the actuating rod by snapping the rod out of the lever with needle-nose pliers.
- Remove the actuating lever.
- Disconnect the electrical connector.


- Remove the motor retaining screws.
- Remove the motor.


Installation Procedure
- Install the motor.
- Install the motor retaining bolts and tighten.


- Install the actuating lever.
- Install the actuating rod.
- Connect the electrical connector.
- Remove the glove box. Refer to Section 9E, Instrumentation/Driver Information.
- Connect the negative battery cable.


Mode Door Motor
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Disconnect the negative battery cable.
- Disconnect the electrical connector.
- Remove the motor actuating rod by snapping out it out of the lever with needle-nose pliers.


- Remove the motor lever.
- Remove the motor retaining bolts.
- Remove the mode door motor.


Installation Procedure
- Install the mode door motor.
- Install the motor retaining screws and tighten.


- Install the motor lever by pressing it onto its shaft.
- Install the actuating rod.
- Connect the electrical connector.
- Connect the negative battery cable.


Temperature Door Motor
Removal Procedure
- Disconnect the negative battery cable.
- Remove the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.
- Disconnect the electrical connector.
- Remove the actuating rod by snapping it out of the lever with needle-nose pliers.


- Remove the motor lever from its shaft by pulling the lever off.
- Remove the motor retaining screws.
- Remove the temperature door motor.


Installation Procedure
- Install the temperature door motor.
- Install the retaining screws and tighten.


- Press the lever onto motor shaft.
- Install the actuating rod onto the lever.
- Connect the electrical connector.
- Install the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.
- Connect the negative battery cable.


Coolant Temperature Sensor
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Disconnect the negative battery cable.
- Remove the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.
- Turn the sensor to release it from the aircon module.
- Disconnect the electrical connector.


Installation Procedure
- Install the coolant temperature sensor into the aircon module and turn the sensor to lock it.
- Connect the electrical connector.
- Install the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.
- Connect the negative battery cable.


Ambient Air Temperature Sensor
Removal Procedure
- Disconnect the negative battery cable.
- Disconnect the ambient air temperature sensor electrical connector.
- Remove the retaining nut from the bracket.
- Remove the ambient air temperature sensor.


Installation Procedure
- Position the ambient air temperature sensor into its bracket.
- Install the retaining nut to the bracket.
Tighten
Tighten the ambient air temperature retaining bracket nut to 6 N•m (53 lb-in).
- Connect the electrical connector.
- Connect the negative battery cable.


In-Car Temperature Sensor
Removal Procedure
- Disconnect the negative battery cable.
- Remove the instrument panel under cover. Refer to Section 9E, Instrumentation/Driver Information.
- Remove the screws securing the in-car temperature sensor with the tube.


Installation Procedure
- Install the in-car sensor.
- Install the in-car sensor retaining screws and tighten.
- Install the air inlet tube and connect the electrical connector.
- Install the instrument panel under cover. Refer to Section 9E, Instrumentation/Driver Information.
- Connect the battery negative cable.


Sun Sensor
Removal Procedure
- Disconnect the negative battery cable.
- Gently pry up on the sun sensor to remove it.


- Secure the electrical connector to prevent it from falling beneath the dash.
- Disconnect the electrical connector.


Installation Procedure
- Connect the electrical connector.


- Insert and press the sun sensor into position in the dash.
- Connect the negative battery cable.


A/C Module
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Disconnect the negative battery cable.
- Remove the instrument panel carrier assembly. Refer to Section 9E, Instrumentation/Driver Information.
- Drain the cooling system. Refer to Section 1D, Engine Cooling.
- Recover the refrigerant. Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System.
- Remove the retaining nuts that secure the suction hose and the liquid evaporator pipe blocks at the fire wall.


- Loosen the clamp bolts from the suction hose and the liquid evaporator pipe to allow movement of the hose and the pipe.
- Remove the evaporator drain hose.
- Compress the heater hose clamps at the fire wall and slide the clamps toward the engine.
- Remove the two heater hoses from the core lines at the fire wall.
- Remove the screws that secure the A/C module to the fire wall on either side of the heater hoses.


- Remove the A/C module screw, that is located above the fuel filter, from the engine compartment side of the fire wall.
- Have an assistant support the A/C module from inside the vehicle.


- Remove the A/C module screws from the evaporator flange on the engine compartment side of the fire wall. The A/C module will start to drop.
- Pull the case straight away from the fire wall.
- Remove the A/C module from the vehicle.


Installation Procedure
- Position the A/C module in the vehicle.
Notice : To avoid damaging the heater core tubes, make sure they do not contact the fire wall opening.
- Slowly raise the A/C module into position and hold it against the fire wall while the screws are installed and tightened from the engine side of the fire wall.
- Align and install the A/C module screws above the fuel filter and at the evaporator flange.
Tighten
Tighten the A/C module screws to 8 N•m (71 lb-in).


- Install the A/C module screws adjacent to the heater hoses.
Tighten
Tighten the A/C module screws to 8 N•m (71 lb-in).
- Install the evaporator drain hose.


- Install the two heater hoses.
- Slide the heater hose clamps into position.
- Remove the instrument panel carrier assembly. Refer to Section 9E, Instrumentation/Driver Information.


- Install new O-rings on the suction hose and the liquid evaporator pipe at the fire wall and put the pipes back in place.
- Install the retaining nuts that secure the suction hose and the liquid evaporator pipe blocks at the fire wall.
Tighten
Tighten the suction hose and the liquid evaporator pipe retaining nuts to 10 N•m (89 lb-in).
- Fill the cooling system. Refer to Section 1D, Engine Cooling.
- Recharge the A/C system. Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System.
- Connect the negative battery cable.


High-Blower Relay
Removal Procedure
- Disconnect the negative battery cable.
- The relay is located in front of the blower motor.
- Remove the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.
- Separate the relay from the connector.
- Remove the screws with the highblower relay.


Installation Procedure
- Install the screws with the highblower relay.
- Connect the electrical connector.
- Install the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.


Power Transistor
Removal Procedure
- Disconnect the negative battery cable.
- Remove the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.
- Disconnect the electrical connector at the resistor.
- Remove the screws from the resistor.
- Remove the resistor from the A/C module by gently pulling the resistor downward.


Installation Procedure
- Install the new resistor into the heater/air distributor case assembly with the screws.
Tighten
Tighten the blower motor resistor screws to 6 N•m (53 lb-in).
- Connect the electrical connector at the resistor.
- Connect the negative battery cable.
- Confirm the proper performance of the blower.
- Remove the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information.


Air Filter
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Remove the hood weather strip.
- Remove the cowl panel. Refer to Section 9D, Wipers/Washer System.
- Remove the air filter cover.


- Remove the air filter.


Installation Procedure
- Install the air filter into its cavity in the fire wall.
- Align the fins on the plastic frame of the filter with the grove in the holder before attempting to insert the filter into place.
- Install the air filter cover.
- Install the cowl panel with the screws.
- Install the hood weather strip.


A/C Expansion Valve
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Remove the retaining nuts that secure the suction hose and the liquid evaporator pipe blocks at the fire wall.


- Remove the expansion valve bolts.
- Remove the expansion valve.
- Remove the O-rings from the evaporator lines.


Installation Procedure
- Clean the O-ring surface areas of dirt or contamination.
- Install the new O-rings on the evaporator lines.
- Install a new expansion valve onto the evaporator lines.
- Insert the expansion valve bolts through the expansion valve into the mount surface of the evaporator flange.
Tighten
Tighten the expansion valve bolts to 10 N•m(89 lb-in).


- Install the retaining nuts that secure the suction hose and the liquid evaporator pipe blocks at the fire wall.
Tighten
Tighten the suction hose and the liquid evaporator pipe retaining nuts to 10 N•m(89 lb-in).


Heater Core
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Remove the aircon module from the vehicle. Refer to "Aircon Module"
in this section.
- Remove the wiring harness from the aircon module.


- Remove the temperature motor lever and actuator rod.


- Remove the mode motor ventilation link.


- Remove the air inlet case with the screws.


- Remove the evaporator core case cover.


- Remove the heater core cover with the screws.


- Remove the heater core clip.


- Remove the heater core from the case.


Installation Procedure
- Install the heater core into the case.


- Install the heater core clip.


- Install the heater core cover.
- Install the tighten the screws that secure the heater core cover to the aircon module.


- Install the evaporator core case cover.
- Install the tighten the screws that secure the evaporator core case cover to the A/C module.


- Install the air inlet case with the screws.


- Install the motor and screws for the floor diverter.
- Install the A/C module. Refer to "A/C Module"
in this section.


Evaporator Core
(Left-Hand Drive Shown, Right-Hand Drive Similar)
Removal Procedure
- Install the heater/air distributor case assembly. Refer to "A/C Module" in this section.
- Remove the screws that secure the evaporator case halves.
- Remove the evaporator core case cover.
- Slide the evaporator flange support plate upward to facilitate the removal of the evaporator.


- Remove the evaporator core from the case.
- Remove the air conditioning expansion valve. Refer to "A/C Expansion Valve"
in this section.


Installation Procedure
- Install the O-rings onto the evaporator tubes.
- Install the A/C expansion valve. Refer to "A/C Expansion Valve"
in this section.


- Install the evaporator core into the case. Center the evaporator flange in the case opening.
- Assemble the evaporator case halves with the screws.
- Install the heater/air distributor case assembly. Refer to "A/C Expansion Valve" in this section.
UNIT REPAIR
V5 AIR CONDITIONING COMPRESSOR OVERHAUL
Compressor Overhaul
- Clutch Coil.
- Clutch Plate and Hub Assembly.
- Clutch Rotor and Bearing.
- Component Locator V5 Compressor.
- Control Valve Assembly.
- Cylinder to Front Head O-Ring.
- Leak Testing (External).
- Pressure Relief Valve.
- Rear Head, Gasket, Valve Plate, Reed Plate, and O-Ring.
- Shaft Seal Replacement.
GENERAL DESCRIPTION AND SYSTEM OPERATION
GENERAL INFORMATION
The V5 System
- System Components - Functional.
- The V5 A/C System.
- V5 Compressor - Description of Operation.
- V5 Compressor - General Description.
System Components-Control
Controller
The operation of the A/C system is controlled by the switches on the control head. This console-mounted heating and ventilation system contains the following knobs and display:
Temperature Control Push Knobs
- Raise the temperature of the air entering the vehicle by pressing the top switch, with the red arrow pointing upward.
- Lower the temperature by pressing the bottom switch, with the blue arrow pointing downward.
- Actuate the air mix door by an electric motor.
- Vary the mix of the air passing through the heater core with the air bypassing the core.
Each press of a switch changes the set temperature by increments of 0.5°C (1°F). This is shown in the temperature window on the function display.
The Function Display
This is an LCD display indicating the status of the control settings selected. Starting from the left end of the display, the sections are as follows:
- Temperature setting - Indicates the temperature set with the temperature control knob.
- Auto status - Indicates whether the system is operating in the full auto mode or the manual mode.
- Defroster icon - Indicates manual selection of full defrost mode.
- Mode - Indicated by icon, the mode chosen by the system in auto (or by the operator in manual) is shown by an illumination arrow indicating the air path.
- A/C - A snowflake icon indicating whether the A/C is ON or OFF.
- Fan speed - Indicates the fan speed by illuminating a bar based on the segment at the front, for low speed, and adding additional segments in order up to the fifth, for high speed.
Eight Additional Push Knobs
- Full defrost - Causes the mode motors to direct all air to the windshield and aide window outlets for maximum defrosting.
- Air intake - Switches between fresh air intake, the default, and recirculating air. Airflow arrows on the display indicate the mode in effect.
- Full Auto Switch - Maintains the set temperature automatically. In this mode, the fully automatic temperature control (FATC) system controls the following:
- The air mix door motor.
- The mode door motor.
- The blower motor speed.
- The inlet air door motor.
- A/C ON/OFF.
- OFF Switch - Turns the automatic air conditioning and fan control off.
- Mode Switch - Allows manual selection of the airflow direction.
- Selection is shown on the function display.
- Each time the mode switch is pressed, the next function is displayed.
- A/C Switch - Allows manual selection and control of the air conditioning function.
- Fan Control Switch - Allows manual selection among five fan speeds.
- Defogger Switch - Turns on the electric defogging heater in the rear window and the outside rearview mirrors, if the vehicle is equipped with heated mirrors.
Pressure Transducer
Pressure transducer switching incorporates the functions of the high-pressure and the low-pressure cutout switches along with the fan cycling switch. The pressure transducer is located in the high-side liquid refrigerant line behind the right strut tower, between the right strut tower and the fire wall. The output from this pressure transducer goes to the electronic control module (ECM), which controls the compressor function based on the pressure signal.
Wide-Open Throttle (WOT) Compressor Cutoff
During full-throttle acceleration, the throttle position sensor (TPS) sends a signal to the ECM, which then controls the compressor clutch.
High RPM Cutoff
As engine rpm approaches the maximum limit, the ECM will disengage the compressor clutch until the engine slows to a lower rpm.