CYKBC, I did some checking with some heating and cooling guys. That little "snow flake" light doesn't always indicate the old style AC compressor clutch on any more. Years back it was powered by the same circuits that turned on the compressor clutch.

Now the light doesn't actually predict that AC compressor is actually running... just that it may be. Most of the time the light is on the compressor is doing something. In the hybrids and electric vehicles, you may get some compressor for de-humidifier on days just above freezing. But depending on who programmed that light, maybe no light.

So general rule, somewhere below 40F and above 32F the compressor won't come on and use any power. You would need a scan tool to actually see the real-time HVAC commands.

 

I've come to learn via this thread that I should just let the computer do its thing.

Thanks for checking. Though I'm a sales guy, I'm a wannabe engineer at heart.

 

This may be somewhat off topic, but I was wondering why it seems that sometimes in colder weather I am not able to engage the recirculate feature on the AC in my 09 Tahoe Hybrid? Does anyone else notice this?

 

I think it is a computer programmed to prevent you from misting the windshield.

 

Makes sense. Thanks!