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you would have to see a mechanic about that problem
Our car had this problem. Answer was a new A/C computer needed.
Check for low coolant
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.
Probably blocked heater matrix. Best thing to do is flush the cooling system with the best stuff you can get.
you are low on coolingliquid !
heater core possibly plugged and leaking
The front expansion valve is clogged.