HVAC question
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2007 GL450
HVAC question
We purchased a CPO GL450, and during delivery the sales rep went over the controls with us. He mentioned that the Auto Setting for HVAC, which kicks on the AC should be left that way so that the AC is always set to on. I have been driving German cars for 24 years, so I realize that to take humidity out of the air you need to turn AC on, but it seems to me that during normal weather conditions this is just running the compressor and dragging down gas mileage. Any view on this from veteran MB owners ?
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Joined: Mar 2008
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From: B.C.
GL 320cdi, Chevrolet Avalanchero, GLE 350 (on order)
Auto is auto. It does not always run in AC. I can hear and feel the compressor kicking on and off in the auto setting, and never kicks in below freezing unless I select only the defrost vents, then it kicks over to AC right away, even at 25 below...
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Joined: Mar 2008
Posts: 903
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From: B.C.
GL 320cdi, Chevrolet Avalanchero, GLE 350 (on order)
secret feature: run the car in auto, park it and turn it off. Then press the button that says "A/C Rest" before you get out. Watch what happens...
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Newbie
Joined: Dec 2009
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2007 GL450
Thanks for the replies. Yes ( per your other "AC/Rest" ) post I love that feature. What you said in this post is that in Auto the compressor does not always run ? When I hit auto the AC button also lights up. I can then turn AC off...but are you saying that even when Auto is selected and the AC button is also lit....that the compressor only is running when needed ?
Super Member
Joined: Mar 2008
Posts: 903
Likes: 23
From: B.C.
GL 320cdi, Chevrolet Avalanchero, GLE 350 (on order)
Thanks for the replies. Yes ( per your other "AC/Rest" ) post I love that feature. What you said in this post is that in Auto the compressor does not always run ? When I hit auto the AC button also lights up. I can then turn AC off...but are you saying that even when Auto is selected and the AC button is also lit....that the compressor only is running when needed ?
I think the light is there just to show the potential of A/C, but does not mean the compressor is running. It's a pretty smart system.
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Super Member
Joined: Mar 2008
Posts: 903
Likes: 23
From: B.C.
GL 320cdi, Chevrolet Avalanchero, GLE 350 (on order)
Well, think about it. If it's like 75 or 23c outside, you might need a little cooling if it's sunny outside. If you set the Thermatic to 70, it will get there pretty fast. If the compressor was running all the time, it would be 55 before you knew it, so it shuts down. It will, however run and mix if the zones are set too far apart, so keep that in mind.
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