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A/c-Heater System - Automatic: Removal & Installation Mazda Millenia I

Automatic HVAC System 7 illustrations ~851 words

REMOVAL & INSTALLATION

WARNINGTo avoid injury from accidental air bag deployment, read and follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.

See A/C-HEATER CONTROL UNIT .

  1. Obtain anti-theft radio code from owner before servicing vehicle. Remove steering column covers. Tilt steering shaft down. Remove cap and panel light control switch.
  2. Remove instrument cluster bezel screws. Tilt instrument cluster bezel forward to disengage clip. Remove instrument cluster bezel. Remove hazard warning switch. Disconnect A/C amplifier 22-pin and 26-pin connectors.
  3. Remove A/C-heater control unit and A/C amplifier as an assembly. Remove screws, and disconnect A/C amplifier 20-pin connector to separate A/C amplifier from A/C-heater control unit. To install, reverse removal procedure.

Remove dashboard. See DASHBOARD. Remove evaporator unit. See EVAPORATOR UNIT. Disconnect air intake actuator connector and blower motor connector. Remove blower unit. To remove blower motor and air intake actuator, disassemble blower unit. (Scheme 7) To install, reverse removal procedure.

Scheme 7

Scheme 7: Removal & Installation

Removal

Discharge A/C system, using approved refrigerant recovery/recycling equipment. Remove right front splash shield. Remove A/C drive belt. Disconnect compressor clutch connector. Disconnect high pressure hose and low pressure hose. Cap openings to prevent moisture from entering system. Remove compressor bolt and compressor.

Installation

To install, reverse removal procedure. Use new "O" rings lubricated with clean compressor oil. When installing new parts, add compressor oil through high pressure side of compressor. If installing new compressor, drain oil from compressor into measuring cup. Subtract this amount plus 0.3-0.6 ounce from 5.92 ounces. The difference is the amount of oil to be added from new compressor. If installing new refrigerant line or hose, add 0.3 ounce of clean compressor oil.

  1. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Raise front of vehicle. Remove ambient temperature sensor. Remove radiator grille, mud guard, front splash shields and hood stay. Remove radiator brackets and coolant reservoir.
  2. Place protective cardboard between condenser and radiator. Lean radiator toward engine. Disconnect refrigerant line from condenser, and cap openings. Remove condenser and receiver-drier with refrigerant line connected. Disconnect refrigerant line from receiver-drier, and cap openings. Remove receiver-drier from condenser.

To install, reverse removal procedure. Use new "O" rings lubricated with clean refrigerant oil. When installing new parts, add compressor oil through high pressure side of compressor. If installing new condenser, add 0.7 ounce of compressor oil. If installing new receiver-drier, add 0.3 ounce of compressor oil. If installing new refrigerant line or hose, add 0.3 ounce of compressor oil.

  1. Obtain anti-theft radio code from owner before servicing vehicle. Disconnect negative battery cable. Using screwdriver, carefully pry off rear console box. Remove brake boot. Remove center panel installation screws. Pull center panel forward to disengage clips. Disconnect harness connectors.
  2. Remove rear console. Remove dashboard undercovers. Remove right side panel. Using long screwdriver, remove glove box screw and glove box. Remove upper and lower steering column covers. Tilt down steering shaft. Remove panel light control switch and hole cover. Remove instrument cluster screws.
  3. Pull instrument cluster bezel forward to disengage clips. Disconnect harness connectors from instrument cluster bezel. Remove security light bulb and socket. Remove instrument cluster bezel. Remove instrument cluster screws, and disconnect remaining harness connectors. Remove instrument cluster.
  4. Disable air bag system. See AIR BAG RESTRAINT SYSTEM article in GENERAL SERVICING. Ensure steering wheel is in straight-ahead position. Remove driver-side air bag module. Remove steering wheel lock nut, and remove steering wheel. Disconnect combination switch connector. Remove screw and combination switch. Remove passenger-side air bag module.
  5. Remove steering shaft. Remove hood release knob. Remove left side panel. Remove center panel side covers. Pull dashboard up and forward. Disconnect harness connectors and remove dashboard. To install, reverse removal procedure.
  1. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Remove dashboard undercover and glove box. Remove glove box stay. Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEM article in GENERAL SERVICING. Remove passenger-side air bag module. Remove compressor manifold-to-evaporator refrigerant line and hose. Remove aspirator hose.
  2. Disconnect power transistor connector and MAX-HI relay connector. Disconnect evaporator temperature sensor connector, and remove evaporator. To remove evaporator and expansion valve, disassemble evaporator unit. (Scheme 8) If removing expansion valve, note location of heat sensing tube for installation reference.

To install, reverse removal procedure. When installing new parts, add compressor oil through high pressure side of compressor. If installing new evaporator, add 1.7 ounces of compressor oil. If installing new refrigerant line or hose, add 0.3 ounce of compressor oil. Evacuate, recharge and leak test system.

Scheme 8

Scheme 8: Installation
  1. Drain engine coolant. Remove dashboard. See «DASHBOARD»(ref-37734-S21093853532001010900000). Remove evaporator unit. See «EVAPORATOR UNIT»(ref-37734-S17185867412001010900000). Remove heater hose clamps and heater hoses. Disconnect quick couplers. Disconnect air mix actuator connector and airflow mode actuator connector.
  2. Disconnect water temperature sensor connector, and remove heater unit. To remove heater core, airflow mode actuator and air mix actuator, disassemble heater unit. (Scheme 9) Note locations of airflow mode main link and sub links for installation reference. To install, reverse removal procedure.

Scheme 9

Scheme 9

Automatic A/C-Heater System Wiring Diagram (2.3L - 1 Of 2). Scheme 10

Scheme 10: Automatic A/C-Heater System Wiring Diagram (2.3L - 1 Of 2)

Automatic A/C-Heater System Wiring Diagram (2.3L - 2 Of 2). Scheme 11

Scheme 11: Automatic A/C-Heater System Wiring Diagram (2.3L - 2 Of 2)

Automatic A/C-Heater System Wiring Diagram (2.5L - 1 Of 2). Scheme 12

Scheme 12: Automatic A/C-Heater System Wiring Diagram (2.5L - 1 Of 2)

Automatic A/C-Heater System Wiring Diagram (2.5L - 2 Of 2). Scheme 13

Scheme 13: Automatic A/C-Heater System Wiring Diagram (2.5L - 2 Of 2)