I have a 2011 Silverado 1500 4x4 crew cab. When I start the truck in morning to warm it up when I go to get in temp guage shows it at operating temp but cold air through the vents no heat through vents till I start driving the truck

 

if your only getting heat when the engine is reved to higher rpms; its a symptom of low coolant level or air in the cooling system.

 

Sorry for this inconvenience, sxander. We will gladly connect you with your local Chevy dealership to have this taken care of. Send us a private message with your VIN, mileage, contact info and preferred dealership if interested.

Amber N
Chevrolet Customer Care

 

Our 05 sub did the same thing when the water pump started leaking and the coolant level dropped. You could actually hear coolant sloshing in the heater core with the air present in the system.