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Home >> Hyundai >> 2017 >> Azera Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater System >> Heater Unit >> Repair Procedures >> Replacement
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Repair Procedures: Replacement

  1. Disconnect the negative (-) battery terminal.
  2. Recover the refrigerant with a recovery/recycling/charging station.
  3. When the engine is cool, drain the engine coolant from the radiator.

    (Refer to Engine Mechanical System - "COOLANT ")

  4. Remove the expansion valve cover (A).
    Fig 1: Locating Expansion Valve Cover With Nut
    G12093419Courtesy of HYUNDAI MOTOR AMERICA
  5. Remove the bolts (A) and the expansion valve (B) from the evaporator core.

    Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.

    Tightening torque  :

    7.8 ~ 11.7 N.m (0.8 ~ 1.2 kgf.m, 5.7 ~ 8.6 lb-ft)

    Fig 2: Locating Expansion Valve And Bolts
    G12093420Courtesy of HYUNDAI MOTOR AMERICA
  6. Disconnect the inlet (C) and outlet (D) heater hoses from the heater unit.
    Fig 3: Locating Inlet And Outlet Heater Hoses
    G12093421Courtesy of HYUNDAI MOTOR AMERICA
    CAUTION: Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on electrical parts or painted surfaces. If any coolant spills, rinse it off immediately.
  7. Remove the crash pad.

    (Refer to Body - "CRASH PAD ")

  8. Remove the cowl cross member.

    (Refer to Body - "COWL CROSS BAR ASSEMBLY ")

  9. Loosen the heater & blower assembly mounting bolts and then remove the heater & blower assembly (A).
    Fig 4: Locating Heater & Blower Assembly With Mounting Bolts
    G12093422Courtesy of HYUNDAI MOTOR AMERICA
  10. Remove the blower unit (B) from heater unit after loosening 3 screws.
    Fig 5: Locating Blower Unit With Mounting Screws
    G12093423Courtesy of HYUNDAI MOTOR AMERICA
    Fig 6: Locating Blower Unit With Mounting Screw
    G12093424Courtesy of HYUNDAI MOTOR AMERICA
  11. Installation is the reverse order of removal, and note these items:
    • If you"re installing a new evaporator, add refrigerant oil (ND-OIL8).
    • Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the right O-rings for R-134a to avoid leakage.
    • Immediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
    • Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately
    • Apply sealant to the grommets.
    • Make sure that there is no air leakage.
    • Charge the system and test its performance.
    • Do not interchange the inlet and outlet heater hoses and install the hose clamps securely.
    • Refill the cooling system with engine coolant
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