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Heater Core Inspection

WARNING: This page is about a different car, the 2021 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
  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 [VIN M] .) (See ENGINE COOLANT REPLACEMENT [VIN Y] .)
  4. Remove the following parts:
    1. Plug hole plate (SKYACTIV-G 2.0, VIN M, VIN Y) (See PLUG HOLE PLATE REMOVAL/INSTALLATION [VIN M] .) (See PLUG HOLE PLATE REMOVAL/INSTALLATION [VIN Y] .)
    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. A-pillar trim (See A-PILLAR TRIM REMOVAL/INSTALLATION .)
    7. 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.] .)
    8. Steering wheel (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
    9. Upper column cover (See COLUMN COVER REMOVAL/INSTALLATION .)
    10. Lower column cover (See COLUMN COVER REMOVAL/INSTALLATION .)
    11. Lower decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)
    12. Upper decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)
    13. Meter hood No. 1 (See METER HOOD REMOVAL/INSTALLATION .)
    14. Center display component (with center display) (See CENTER DISPLAY REMOVAL/INSTALLATION .)
    15. Instrument cluster (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
    16. Meter hood No. 2 (with Active driving display) (See METER HOOD REMOVAL/INSTALLATION .)
    17. Active driving display (with Active driving display) (See ACTIVE DRIVING DISPLAY REMOVAL/INSTALLATION .)
    18. Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION .)
    19. Switch panel (See SWITCH PANEL REMOVAL/INSTALLATION .)
    20. Cup holder (See CUP HOLDER REMOVAL/INSTALLATION .)
    21. Selector lever knob (ATX) (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION .)
    22. Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION .)
    23. Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION .)
    24. Side wall (See SIDE WALL REMOVAL/INSTALLATION .)
    25. Rear console (See REAR CONSOLE REMOVAL/INSTALLATION .)
    26. Hood release lever (See HOOD RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION .)
    27. Fuel-filler lid opener lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION .)
    28. Driver-side lower panel (See LOWER PANEL REMOVAL/INSTALLATION .)
    29. Knee bolster (See KNEE BOLSTER REMOVAL/INSTALLATION .)
    30. Center lower panel (See CENTER LOWER PANEL REMOVAL/INSTALLATION .)
    31. Indicator unit (See INDICATOR UNIT REMOVAL/INSTALLATION .)
    32. Climate control unit (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .)
    33. Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
    34. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
    35. Passenger-side lower panel (See LOWER PANEL REMOVAL/INSTALLATION .)
    36. Clock spring (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)
    37. Wiper and washer switch (See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION .)
    38. Light switch (See LIGHT SWITCH REMOVAL/INSTALLATION .)
    39. Steering wheel and column component (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
    40. Rear vent duct (with rear vent duct) (See REAR VENT DUCT REMOVAL/INSTALLATION .)
    41. Selector lever component (ATX) (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION .)
    42. Dashboard (See DASHBOARD REMOVAL/INSTALLATION .)
    43. Front heat duct (See FRONT HEAT DUCT REMOVAL/INSTALLATION .)
    44. Blower unit (See BLOWER UNIT REMOVAL/INSTALLATION .)
    45. Foot support (See FOOT SUPPORT REMOVAL/INSTALLATION .)
  5. Remove the A/C unit. (See A/C UNIT REMOVAL/INSTALLATION .)
  6. Remove the heater core. (See A/C UNIT DISASSEMBLY/ASSEMBLY .)
  7. Inspect the heater core for damage, cracks, and water leakage.
  8. Visually inspect the fins for bending.
    • If there is any bending, use the end of a flathead screwdriver to straighten the fins.
  9. Visually inspect the heater hose for deformation.
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