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Evaporator Temperature Sensor Inspection (Manual A/C)

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Inspect the evaporator temperature sensor when it is installed to the A/C unit.
  1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  2. Remove the following parts:
    1. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
    2. Side wall (passenger-side) (See SIDE WALL REMOVAL/INSTALLATION .)
    3. Front heat duct (passenger-side) (See FRONT HEAT DUCT REMOVAL/INSTALLATION .)
  3. Connect the negative battery cable.
  4. Switch the ignition ON (engine on).
  5. Set the fan speed to MAX HI.
  6. Set the temperature control to MAX COLD.
  7. Set to the RECIRCULATE mode.
  8. Turn the A/C switch off.
  9. Close all doors and windows.
  10. Wait for 5 min.
  11. Switch the ignition off.
  12. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  13. Disconnect the evaporator temperature sensor connector.
    Fig 1: Evaporator Temperature Sensor Connector
    G11529349Courtesy of MAZDA MOTORS CORP.
  14. Measure the temperature at the blower inlet.
  15. Measure the resistance between the evaporator temperature sensor terminals A and B.
    Fig 2: Locating Evaporator Temperature Sensor Terminals A And B
    G11431410Courtesy of MAZDA MOTORS CORP.
    Fig 3: Evaporator Temperature Sensor Resistance Graph
    G09075889Courtesy of MAZDA MOTORS CORP.
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