Service Manual Update for A/C Evaporator Temperature Sensor Performance - Chart 11

Important: This bulletin applies to the paper Service Manual only.

The purpose of this bulletin is to provide technicians with voltage-to-temperature conversion information to diagnose the evaporator function status. This information will aid in the diagnosis of the "A/C Evaporator Temperature Sensor Performance - Chart 11" on pages 67 and 68 of the 2002-2003 Saturn VUE HVAC Service Manual, Vol. 1.

The chart on the next page provides the technician with information that will convert the current Service Manual temperature sensor voltage readings per the scan tool A/C sensor reading in the BCM to a comparable temperature value to assist with diagnosis of the "A/C Does Not Engage" symptom.

Important: This chart shows voltage and associated temperatures for the "A/C Does Not Engage" symptom that is experienced on the vehicle. If the A/C is not engaged, these low temperature readings should not be present and may indicate that the sensor is inaccurate and needs to be replaced. If the temperature/voltage readings are at ambient temperature, the sensor is functioning correctly and is not a reason for the "A/C Does Not Engage" condition. If an open or ground condition is found when testing the sensor, sensor should be replaced. Refer to "A/C Refrigerant Temperature Sensor Removal and Installation" procedures in the 2002-2003 Saturn VUE HVAC Service Manual, Vol. 1.