2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 09-01-38-004 Date: 090731

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 09-01-38-004 Date: 090731

A/C - A/C Indicator Or Recirculation Indicator Flashing

INFORMATION

Bulletin No.: 09-01-38-004

Date: July 31, 2009

Subject: Information on Vehicles with HVAC Control Module A/C and Recirculation Indicators Flashing

Models:

2008-2010 Buick Enclave

2007-2010 Cadillac Escalade Models

2007-2010 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2009-2010 Chevrolet Traverse

2007-2010 GMC Acadia, Sierra, Yukon, Yukon XL

2007-2010 Saturn OUTLOOK

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 251

Condition/Concern

Important

DO NOT replace the HVAC Control Module for a flashing A/C Indicator or flashing Recirculation Indicator, as this is normal operation.

Some customers may comment on any of the following conditions:

- The Air Conditioning (A/C) indicator on the heating ventilation and air conditioning (HVAC) control module flashes then turns OFF after

they press the A/C button.

- The Recirculation indicator on the HVAC control module flashes then turns OFF after they press the Recirculation button.

- The passenger (PASS) temperature setting flashes then turns OFF after they press the PASS button.

- The driver and passenger temperature settings revert to previous temperature settings when changing from defrost to bi-level, vent, floor or

defog.

This is normal operation for the HVAC Control Module and indicates that the A/C, Recirculation and Passenger functions are not available at this

time.

The following parameters are reasons that the A/C functions may not be available (calibrated values vary by program):

- Ambient air temperature (AAT) is too cold (if equipped with Ambient Air Temperature Sensor)

- Vehicle system voltage is less than 9.5 volts

- Refrigerant pressure is too low

- Refrigerant pressure is too high

- Engine coolant temperature (ECT) is too high

- Engine is not in RUN

- HVAC Control Head is in the OFF position

The following mode settings are reasons Recirculation may not be available:

- Mode switch set on Floor

- Mode switch set on Defog

- Mode switch set on Defrost

The following mode setting is the reason the passenger mode may not be available:

The mode switch is set on Defrost.

Note

The reason(s) A/C is currently disabled can be viewed with a Tech 2(R) by navigating to HVAC Data display and viewing the A/C Permission

parameter.

Recommendation/Instructions

Note

To maintain the highest level of customer satisfaction, INFORM the customer of all of the following conditions:

- The flashing A/C indicators on the HVAC control module represent normal operation and indicate that the A/C, Recirculation and/or

Passenger functions are not available at this time.

- Changing the passenger temperature setting while in the Defrost mode will change the Driver temperature setting.

- Changes made to temperature settings while in Defrost mode will revert to the previous settings upon returning to Bi-level, Vent, Floor or

Defog.

Consult the appropriate vehicle Service Information (SI) for a detailed HVAC Description and Operation.