Low coolant and a clogged heater core are possibilities.
faulty control valve on heater or air in the lines
You need to change your thermostat in the car.
The heater core is leaking coolant.
Heater blower motor is defective and locked up, or possible short in the wiring.
it is your heater core most likey
Depends. You might be low on coolant. Or your heater core could be clogged. Neither of those instances is particularly "safe". But, it could just be a blend door, which wouldn't matter.
AnswerBad thermostat, clogged heater core, or a defective heater control switch. If an engine has not been running long it will not have warmed up, the warmth from a car heater usually comes from the engine.
Low on coolant. Bad thermostat. plugged heater core. Temp blend door malfunction.
You might need a new thermostat or heater core.
Low on coolant. Stuck open thermostat. Plugged heater core. Temp blend door inop.
needs heater core replaced wost likely be hind the glove box