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Evaporator Temperature Sensor Inspection (Auto A/C)

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. Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
    2. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
    3. side wall (passenger-side) (See SIDE WALL REMOVAL/INSTALLATION .)
  3. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  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: Detaching Evaporator Temperature Sensor Connector
    G11431372Courtesy 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: Evaporator Temperature Sensor Connector Terminals
    G11431373Courtesy of MAZDA MOTORS CORP.
    Fig 3: Evaporator Temperature Sensor Resistance Graph
    G09075851Courtesy of MAZDA MOTORS CORP.
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