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Home › Mazda › 2021 › CX-9 Signature › Repair and Diagnosis › Heating, Ventilation & A/C (HVAC) › HVAC Control Systems › Basic System › Front Heater Core Inspection

Front Heater Core Inspection

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Discharge the refrigerant. (See REFRIGERANT RECOVERY .) (See REFRIGERANT CHARGING .)
  3. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.5T] .)
  4. Remove the following parts:
    1. Plug hole plate (See PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
    2. Windshield wiper arm and blade (See WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION .)
    3. Cowl grille (See COWL GRILLE REMOVAL/INSTALLATION .)
    4. Front scuff plate (See FRONT SCUFF PLATE REMOVAL/INSTALLATION .)
    5. Front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
    6. Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
    7. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
    8. Passenger-side decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)
    9. A-pillar trim (See A-PILLAR TRIM REMOVAL/INSTALLATION .)
    10. Driver-side air bag module (See DRIVER-SIDE AIR BAG MODULE REMOVAL [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) (See DRIVER-SIDE AIR BAG MODULE INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)
    11. Steering wheel (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
    12. Upper column cover (See COLUMN COVER REMOVAL/INSTALLATION .)
    13. Meter hood (See METER HOOD REMOVAL/INSTALLATION .)
    14. Instrument cluster (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
    15. Lower column cover (See COLUMN COVER REMOVAL/INSTALLATION .)
    16. Clock spring (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)
    17. Wiper and washer switch (See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION .)
    18. Light switch (See LIGHT SWITCH REMOVAL/INSTALLATION .)
    19. Hood release lever (See HOOD RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION .)
    20. Fuel-filler lid opener lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION .)
    21. Driver-side lower panel (See DRIVER-SIDE LOWER PANEL REMOVAL/INSTALLATION .)
    22. Knee bolster (See KNEE BOLSTER REMOVAL/INSTALLATION .)
    23. Joint cover (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
    24. Steering shaft (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
    25. Selector lever knob (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION .)
    26. Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION .)
    27. Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION .)
    28. Front console (See FRONT CONSOLE REMOVAL/INSTALLATION .)
    29. Side wall (See SIDE WALL REMOVAL/INSTALLATION .)
    30. Rear console (See REAR CONSOLE REMOVAL/INSTALLATION .)
    31. Selector lever component (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION .)
    32. Selector lever bracket (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION .)
    33. Passenger-side lower panel (See PASSENGER-SIDE LOWER PANEL REMOVAL/INSTALLATION .)
    34. Front climate control unit (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION .)
    35. Center display (See CENTER DISPLAY REMOVAL/INSTALLATION .)
    36. Connectivity master unit (CMU) (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION .)
    37. Dashboard (See DASHBOARD REMOVAL .) (See DASHBOARD INSTALLATION .)
    38. Front heat duct (See FRONT HEAT DUCT REMOVAL/INSTALLATION .)
    39. Blower unit (See BLOWER UNIT REMOVAL/INSTALLATION .)
    40. Foot support (See FOOT SUPPORT REMOVAL/INSTALLATION .)
    41. Front A/C unit (See FRONT A/C UNIT REMOVAL/INSTALLATION .)
    42. Front heater core (See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY .)
  5. Inspect the front heater core for damage, cracks, and water leakage.
  6. Inspect the fins for bending.
  7. Inspect the heater hose for deformation.
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