Q: my heater blows cold air... on 2004 Chevrolet Impala

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i use the heater or even the front window defrost, it blows cold air. it's really getting on my nerves bc i can't see out of the window in the mornings! any suggestions?
(1) Answer
Is the air temp cold on both the drivers and passenger sides? If so then I would suspect poor coolant flow through the heater core. The hoses near the fire wall in the engine compartment should both be warm when the engine is warm. If only one hose is warm then there is no flow. If both hoses are warm then I would suspect a fault with one or both of the temperature door actuators behind the dash.