Want this question answered?
it has a partially clogged heater core.replace the heater core
Low coolant in the system. Defective heater control valve. Clogged heater core.
Your heater will blow cold air only.
Possible causes are, low on coolant, thermostat stuck open, clogged heater core or vacuum scorce not getting to the heater control.
A restricted/plugged heater core can do that. Try flushing the heater core.
It could be the thermostat on the engine. If the engine does not warm up adequately the heater will never blow hot air.
check thermostat, might be stuck closed.
check you antifreze level if it is low you wont have eat or if you get lots of fog your heater core is bad
replace front heater corefront and rear have independent heater cores
The heat valve is stuck open.
you may not have the heater water hoses plugged in
Your thermostat is the likely culprit here it is probably stuck closed. Have it checked out.