3.0 Duramax active shuters

[Booger T]

Does any one know what criteria needs to be met for the active shutters to function on trucks with the 3.0 Duramax? I have never seen mine closed, even on cold starts when temp is in the teens and 20's they are open. The ones on my wife's 2020 HD 6.6 gasser are always closed on cold start ups. Just curious why I have never seen them shut.  Thanks

[BigBadSierra]

You better get out on the nose and look over when you are at speed..lol.

 

I fairly sure they only close at speed.

[Chris Callanan]

Yeah, I believe the shutters on the 1500 are for aero, not for engine temp control..

 

That being said, I have no idea what the criteria is for them to close..    I've always thought it would be a good addition to some screen on the DIC to show open or closed...

 

 

[OnTheReel]

Generally speaking, the shutters are open at low speeds or when parked, and close at highway speeds to improve aerodynamics. So you’re not likely to ever see them closed unless you hang over the hood at 60 mph.

[newdude]

Here is the description and operation on the shutter system.

Quote

 

Active Grille Air Shutter Description and Operation

 

The active grille air shutter system closes shutters in the front grille to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front end airflow are not required. If high levels of airflow are required the active grille air shutter system will open one or both shutters. The control signal from the engine control module, ignition and ground circuits enable the active grille air shutter actuators to operate. If the conditions for opening the shutters are reached the engine control module commands the active grille air shutter actuators to open one or both shutters.

 

The dual active grille air shutter system consists of two aero shutter mechanisms located in the front grille for controlling the amount of air flowing through the grille. It includes three wires; ground, power and a Local Interconnect Network (LIN) Bus serial data circuit from the engine control module to the shutter actuator. The engine control module determines shutter state based on various vehicle conditions such as vehicle speed, coolant temperature, fan state, refrigerant system pressure, A/C compressor state and ambient temperature. The engine control module has the ability to command each shutter individually to the open or closed positions through communications on the LIN Bus.

 

The actuators are powered by an ignition circuit that is active when the key is in the RUN position. The vehicle may have to be driven for up to 13 minutes at speeds greater than 41 km/h (25 mph) before a shutter begins to move. If low ambient temperature is detected, the shutters will remain in the closed position.

 

 

[Booger T]

Ok, Thanks.  I actually did see them closed this morning right after starting.

[Moend]

Yeah when I was wiping down the truck after the car wash and it was -20°F I seen the shutter closed. But mine is a 5.3

[joelabq]

Yeah when I was wiping down the truck after the car wash and it was -20°F I seen the shutter closed. But mine is a 5.3

I'm more impressed with the fact that you were wiping your truck down after a car wash in -20F. I don't care how dirty when the temps are below +20F. That's hard core my friend!

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[ArTurf]

Are shutters only on diesels? First time hearing about them

[Time2gofishing1980]

No, they've been around for some years now.  My 2014 5.3 had them

[spizike9]

On 1/24/2020 at 7:59 PM, Moend said:

Yeah when I was wiping down the truck after the car wash and it was -20°F I seen the shutter closed. But mine is a 5.3

You saw the shutter closed. Sorry to be that guy. 

[spizike9]

31 minutes ago, Time2gofishing1980 said:

No, they've been around for some years now.  My 2014 5.3 had them

 

2 hours ago, ArTurf said:

Are shutters only on diesels? First time hearing about them

I believe 2014 was the first year for them but I could also very much be wrong. 

[19sierra53]

My 19 5.3 does not have. All the mounts are there, but there is no shutters in place. Maybe it is removed with tow package?

[spizike9]

3 hours ago, 19sierra53 said:

My 19 5.3 does not have. All the mounts are there, but there is no shutters in place. Maybe it is removed with tow package?

Do you have max tow package? My ‘18 has them and I have tow package but not max tow package. 

[19sierra53]

Nope not max tow, just the normal one and x31. Strange, maybe the higher trims get it and the lower doesn't