Sounds like a stuck thermostat.
My heater doesn't go cold. But to answer your question, check the engine coolant level in the radiator. Be sure that the engine is cold before removing the radiator cap. --Ken
A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.
The #1 cause of cold air from the heater when the car is stopped, or the engine is idling, low engine coolant levels.
Feel the temperature of the heater pipes in the engine bay, where they pass through the front bulkhead. If they are both hot then the fault is most likely the air regulator flap stuck. Look here http://tinyurl.com/67pl3d for help.
A common cause is the thermostat being stuck in an open position.
An engine block heater for a 2004 Hyundai Tiburon is a part of the engine that helps keep the engine warm when it is very cold outside. It has a plug that needs to be plugged into an electric outlet when the car has to sit in the cold weather.
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.
if youre trying to turn the heater on and cold air comes out, then its most likely the heater core
Is an electrical device used to heat coolant of a vehicle at extreme cold condition for easy startup.
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.
Because it's broken.
it's old and you need to change it.