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HVAC Discuss Heating, Ventilation & Air Conditioning related issues on Duramax equipped trucks.

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Old 02-15-2020, 09:52 PM   #1 (permalink)
schofield95
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HVAC issue, unable to find answer

I have an 07 Duramax LMM with the push button hvac controls. I tend to keep the hvac on defrost all winter. This year it started acting up. After a half hour or hour, it automatically changes to the dash vents but continues to blow the correct temperature. When it changes to the dash vents it will not allow me to change vents. After I shut the truck down and restart it the system works normally again.

I pulled all hvac fuses and reset the system but it made no change.

Any ideas?

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Old 03-05-2020, 08:31 AM   #2 (permalink)
oldschoolbowtie
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This is a great question

I have no idea

but I know a guy at GM Dealer

I will ask him

I love a good mystery

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2007.5 3500HD Silverado LTZ
Kennedy Custom Tune Banks Intake and 4 " exhaust, Air Dog 150, Leveled front end, aftermarket upper control arms, tie rod end sleeves, bypass oil filter, Pusher 3" "hot side" charger tube, aFe Turbo inlet pipe, PPE deep Trans Pan with temp gage, 2 low mod for front differential disable, PACBRAKE 5000# Air Bags with remote on board air...otherwise stock


1953 Chevy truck 496 2 NOS kits ...otherwise stock


1927 Roadster 383 2 NOS kits chassis car (street legal)// otherwise stock
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Old 03-05-2020, 03:49 PM   #3 (permalink)
oldschoolbowtie
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Talked to my friend at stealership

he said its likely the head unit

he said that if it was his truck he would learn to live with it



best I got

good luck
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Al


2007.5 3500HD Silverado LTZ
Kennedy Custom Tune Banks Intake and 4 " exhaust, Air Dog 150, Leveled front end, aftermarket upper control arms, tie rod end sleeves, bypass oil filter, Pusher 3" "hot side" charger tube, aFe Turbo inlet pipe, PPE deep Trans Pan with temp gage, 2 low mod for front differential disable, PACBRAKE 5000# Air Bags with remote on board air...otherwise stock


1953 Chevy truck 496 2 NOS kits ...otherwise stock


1927 Roadster 383 2 NOS kits chassis car (street legal)// otherwise stock
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Old 03-05-2020, 06:42 PM   #4 (permalink)
heymccall
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If like to see if it has any HVAC codes when connected to Tech II. My scanner won't read HVAC codes.
I'm leaning toward it being a faulty mode actuator. They're about $50, and fairly easy to change (as opposed to the recirculate actuator).
The system locks out an actuator when the feedback sensor on the actuator is erratic.
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