Evaporator Temperature Sensor Inspection

2004 Oldsmobile Bravada RWDSECTION Evaporator Temperature Sensor Inspection
WARNING: This page is about a different car, the 2004 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. Set the fan speed MAX HI.
  2. Set the temperature control at MAX COLD.
  3. Set the RECIRCULATE mode.
  4. Turn the A/C switch off.
  5. Close all doors and windows.
  6. Wait for 5 min. 
  7. Disconnect the evaporator temperature sensor connector.
  8. Measure the temperature at the blower inlet.
  9. Measure the resistance between the evaporator temperature sensor terminals.
    • If the resistance is not as shown in the graph, replace the evaporator temperature sensor.
    Fig 1: Resistance Vs Temperature Graph
    G00975604Courtesy of MAZDA MOTORS CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.