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.

Set the fan speed MAX HI.
Set the temperature control at MAX COLD.
Set the RECIRCULATE mode.
Turn the A/C switch off.
Close all doors and windows.
Wait for 5 min.
Disconnect the evaporator temperature sensor connector.
Measure the temperature at the blower inlet.
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
Courtesy of MAZDA MOTORS CORP.