08 HVAC issue


I've looked through the posts and see many AC related issues but none that answer my question; I have a 2008 Silverado work truck, V6, auto. AC works, fan works, heat is intermittent depending on where it's set (defrost, feet, etc)and does not seem to get real hot, also the control for where the air blows (feet, defrost, etc.) seems to have a mind of its own.
We've checked fusses but cannot find a problem.
Any ideas, winter is coming!
Thanks

 

1st off, is there enough radiator fluid in the radiator? If not enough it will not heat.

 

Yep, radiator is is topped off with the proper amount of antifreeze.

 

Hello khum,

Welcome to the Chevrolet Forum! We are happy to have you part of the community on here. I am sorry you are experiencing HVAC issues with your 2008 Silverado. We would like the opportunity to look into this for you. Please reach out to us via private message and include your contact information, VIN and current mileage. We look forward to hearing from you.

Sincerely,

Laura M.
Chevrolet Customer Care

 

Not sure how to connect via private message???

 

Hi khum,

Welcome to the Chevrolet forums.

How many owners has the truck had?

Have you verified that you have a thermostat

in the cooling system? Here down south, many

folks remove them completely.

 

Hi khum,

You can send us a private message by clicking on our screen name and the drop down will have a "Send a private message" option.

Amber N.
Chevrolet Customer Care

 

I am the second owner, I cannot confirm that it has a thermostat in place, I suppose that would be a good place to start, although the temp gauge never changes once it warms up no matter what the temp is outside (winter or summer).

 

Usually as you start driving the heat will get to around 200 (195 degree thermostat)and then suddenly the temp drops to 170, which indicates the thermostat opened up. If it does not do this, then either there is not one or the one present is not functioning properly.

 

If you are in a northern climate, IMHO, it would help level the playing

field, to go to the minimal DIY expense to change the thermostat and

gasket, also a new overflow cap. Dayco, Gates, or Stant brands are my

personal preference.

Sometimes the OE senders aren't that sensitive. So, you may or may

not see a deflection, as the thermostat opens and closes.