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Winter guard

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If the shutters would suffice, why would GM spend the $ to give you a guard mask?


Tongue in cheek or sarcastic  reply.  

Edited by NWStever
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The shutters are for aerodynamics....  reduce overall aero drag of the truck when engine cooling is adequate. The shutters are suppose to open as the engine water temp increases above some setpoint temperature. 

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  • 2 weeks later...

The supplement to the diesel supplement to the owners manual has a note. Don't know why gm would make two different supplements. Anyway, setting at the mall waiting on wife, I organized the glovebox and found it...


So now I guess the question remains. But truck does have the bra on.





Edited by gemarsh
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Not sure on GM but I remember with my F-150 the shutters would default to partially open below a certain temp to prevent freezing shut.  As mentioned above, the primary purpose of the shutters is aerodynamics.















































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On 12/12/2022 at 8:16 AM, gemarsh said:

We are going to dip to single digits for the high for awhile here. Does the active shutters work in place of the winter guard?






No.  The shutters are for aerodynamic purposes.    


Winter Cover

If equipped, the winter cover should be used to enhance heater performance in cold conditions below -5 °C (23 °F). The winter cover installs over the grille and restricts airflow to the engine compartment.

For vehicles that did not come with a winter cover, a GM winter cover can be purchased. See your dealer for additional information.

When the winter cover is in use, the heater, ventilation, and air conditioning AUTO mode may not function properly. Use the manual settings for comfort.

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  • 2 weeks later...

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