1) Turn the ignition switch to OFF.
2) Remove the glove box.
3) Disconnect the connector from evaporator sensor.
4) Measure the resistance between terminals of the evaporator sensor.
Terminals
No. 1 — No. 2:
Is the resistance approx. 6.2 kΩ at 0°C (32°F) and approx. 3.3 kΩ at 15°C (59°F)?
Replace the evaporator sensor.