Grand Cherokee 2WD V8-4.7L VIN J (2004)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
Ambient Temperature Sensor Test
1. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Disconnect the ambient temperature sensor wire
harness connector.
2. Measure the resistance of the ambient temperature sensor. At -40° C (-40° F), the sensor resistance is 336.6 kiloohms. At 60° C (140° F), the
sensor resistance is 2.49 kilohms. The sensor resistance should read between these two values. If OK, refer to Diagnosis and Testing - Ambient
Temperature Sensor Circuit. If not OK, replace the faulty ambient temperature sensor.