Silverado HVAC not turning off

[Zipsort]

Ive been noticing lately even if I shut my HVAC completely off it still blows air (hot or cold).  Whats the point of having a power off button if it doesnt even do anything?  It seemed to also dim up and down in intensity depending on throttle.  Anyone else doing this?  Also, it smells a little funny.  Almost a grease/must type of smell, not super pleasent. 

 

2015 Silverado 23k miles

Edited November 19, 2020 by Zipsort

[silveradosid]

dimming up and down can be caused a battery that is weak, the smell could be the cabin air filter, change both

[Eddie 70]

Have you tried to make sure the AC drain line is clear. Run a long tywrap up in it and give it a good push-pull-twist a few times to see if that will clear the drain. Trapped moisture can allow mildew to grow and cause some funky odors.

 

 

[Zipsort]

8 hours ago, Eddie 70 said:

Have you tried to make sure the AC drain line is clear. Run a long tywrap up in it and give it a good push-pull-twist a few times to see if that will clear the drain. Trapped moisture can allow mildew to grow and cause some funky odors.

 

 

 

 

Thanks for the battery idea, however I dont think it would have anything to do with the HVAC fan blowing (decently hard too) but I will probably replace my battery as it is around that age,

 

And thank you I will check that out!

[JimCost2014]

1 hour ago, Zipsort said:

 

 

Thanks for the battery idea, however I dont think it would have anything to do with the HVAC fan blowing (decently hard too) but I will probably replace my battery as it is around that age,

 

And thank you I will check that out!

And like Eddie suggested, especially if you have never changed the cabin filter, I would do so.

 

You will be amazed how much crap they stop from entering the truck and how plugged up they become, restricting air flow for the HVAC.

 

The battery going bad will cause issues you would never even think of in the new "rolling computer" trucks we drive.

Edited November 21, 2020 by JimCost2014