Check for low coolant
you would have to see a mechanic about that problem
Check to insure that the engine coolant is full and the thermostat is not stuck. Without the heated fluid from the engine the heater will always blow cold air.
Probably because coolant level is low
Your heater will blow cold air only.
It doesn't really blow it out it just warms the cold air.
you need to replace your heater core
it wont blow heat itll blow cold air
Check the following........... 1. A/C heater control doors. 2. A/C heater controller. 3. Trash in the heater box. 4. Partly clogged up heater core.
you are low on coolingliquid !
heater core possibly plugged and leaking
The front expansion valve is clogged.
you may not have the heater water hoses plugged in