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Heater Core Removal/Installation

NOTE:
  • If a heater core leak is suspected, the heater core must be leak tested before it is removed from the vehicle; See HEATER CORE INSPECTION .
  1. Remove the instrument panel; see INSTRUMENT PANEL REMOVAL/INSTALLATION .
  2. Remove the evaporator core housing; See EVAPORATOR CORE HOUSING REMOVAL/INSTALLATION  .
  3. Remove the powertrain control module (PCM). See POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION .
  4. Remove the PCM heat sink.
    1. Remove the ground strap screw.
    2. Remove the heat sink.
      Fig 1: Removing PCM Heat Sink
      G03730748Courtesy of MAZDA MOTORS CORP.
  5. Remove the four nuts from the engine side of the dash panel. Position the plenum chamber on the vehicle floor.
    Fig 2: Removing Nuts From Engine Side Of Dash Panel
    G03730749Courtesy of MAZDA MOTORS CORP.
  6. Remove the heater core cover.
    1. Remove the screws.
    2. Remove the heater core cover.
      Fig 3: Removing Heater Core Cover
      G03730750Courtesy of MAZDA MOTORS CORP.
  7. Remove the heater core.
    Fig 4: Removing Heater Core
    G03730751Courtesy of MAZDA MOTORS CORP.
  8. To install, reverse the removal procedure.
    • During installation, be sure to install an new oval foam seal around the heater core inlet and outlet tubes.
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