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This light flashing can indicate a few different components that may be at fault causing this.GM has released a bulletin on this and these would need checked into further to see which component is causing this here.If your outside temperature is reading incorrectly possibly less then 40 degrees this will cause this here and may be due to a faulty temp sensor or wiring to the sensor.Here is the bulletin info and does need checked into further to locate and correct this fault:
- A/C - Indicators Flashing (Normal Condition)
Bulletin No.: 07-01-38-003
Date: June 12, 2007
Information for Vehicles with HVAC Control Module A/C And Recirculation Indicators Flashing Models:
2008 Buick Enclave
2007-2008 Cadillac Escalade Models
2006-2007 Chevrolet Monte Carlo
2006-2008 Chevrolet Impala
2007-2008 Chevrolet Avalanche, Equinox, Silverado, Suburban, Tahoe
2007-2008 GMC Acadia, Sierra, Yukon Models
2007-2008 Pontiac Torrent
2008 HUMMER H2
2007-2008 Saturn OUTLOOK
2008 Saturn VUE
Some customers may comment that 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. Others may comment that the Recirculation indicator on the HVAC Control Module flashes then turns off after they press the Recirculation button.
This is normal operation for the HVAC Control Module and indicates that the A/C or Recirculation function is not available at this time.
Reasons that the A/C may not be available (calibrated values vary by program) are listed below. Consult the appropriate vehicle Service Information (SI) for detailed HVAC Description and Operation:
Ambient Air Temperature is too low (if equipped with Ambient Air Temperature Sensor)
Vehicle voltage less than 9.5 volts
Refrigerant Pressure too low
Refrigerant Pressure too high
Engine Coolant Temperature too high
Engine is not in RUN
HVAC Control Head is in the OFF position
Reasons Recirculation may not be available: Mode switch in Floor, Defog or Defrost mode.
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.
Do not replace the HVAC Control Module for a flashing A/C Indicator or flashing Recirculation Indicator, as this is normal operation.
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