Rick's Free Auto Repair Advice

AC light flashing GM vehicles

Fix AC light flashing GM vehicles

GM has issued a technical service bulletin #09-01-38-004: INFORMATION FOR VEHICLES WITH HVAC CONTROL MODULE A/C AND RECIRCULATION INDICATORS FLASHING. The bulletin applies to the following vehicles:

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

The A/C light is designed to flash and disallow A/C operation if any of the following conditions are present:

Ambient air temperature (AAT) is too cold (35 degrees or colder)
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

Fix these issues and try the A/C again


© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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