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yes it would save money :)
The moveable "baffle" inside the dashboard is not redirecting the air flow as it should. It's operated either by vacuum or an electric motor, in either case, repair is going to require the removal of the dashboard.
The most likely cause would be a vacuum leak at the rear of the engine or a defective selector switch.
a fuse
This is a very common problem and you need to check for a vacuum leak, broken vacuum line or a loose vacuum line......
Pin cone
There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.
There are two separate accumulators one for front and one for rear
Either you have a blockage present or your vents on your sewer lines have become blocked or you need to install more vents.
yes
Bad heater core.
The motor which blows air through the vents.