sounds like the cable from the knob is streached/broken or flap has stuck closed
I have a 2006 Altima and it is doing the same thing.
that is bad... go get it checked up on!
Poor circulation from a restricted/plugged heater core. Try flushing it.
Check your coolant levels, and check your thermostat - it may need replacing. Also check your heater hoses to ensure they're not leaking.
jack up front end , remove coolant cap,turn on heater, turn on car rev up a bit. do this until heater blows hot air...
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
Get the air out of your heater core.
The heater fan ONLY blows the air, it does not make the temperature of that air. Your heater temperature controls how hot the air is. Adjust your heater temperature for hotter or cooler air.
we changed radaitor & thermastate , now heater blows cold air
heater hoses might have been disconected