A/C light flashing on GM vehicles

A/C light flashing on 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

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For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

If you just need information for a single repair and want to save money,eautorepair offers a lower price 1-week subscription for only $11.99. Or, if you’ll be working on this vehicle in the future, you can buy a 1-year subscription (Alldatadiy.com for $26.99, or eautorepair.net $29.99)

© 2012 Rick Muscoplat

Alldata and Eautorepair are both professional grade shop manuals. You’ll find more in-depth information and more complete wiring diagrams, along with descriptions of how the systems work. And, you’ll get all that at a price you can afford. Check them out!

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