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.
engine not warm, low coolant, or stuck thermostat
Most likely cause is a failed engine thermostat.
Interior heat uses the engine heat. If the engine is still cold, the heater will blow cold. If the engine is warm and the heater is blowing cold, you have a problem with the heater. Check the water in the radiator and see if it is rusty. If it is rusty, change your coolant, thermostat, and hoses. Look at the heater hoses when someone steps down on the gas pedal. If a hose collapses, replace your heater hoses. Otherwise take it to a mechanic.
Your heater will blow cold air only.
check heater core could be cloggedCheck the engine coolant level also.*no, the heater relies on the engine for heat and when you drive the engine warms generating heat:)*
It doesn't really blow it out it just warms the cold air.
bad engine thermastat With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
Low coolant. If the coolant is low then the heater core is not able to transfer heat in to the car.
you need to replace your heater core
it wont blow heat itll blow cold air
I just had this problem on my 2005 Impala. My fix was a new thermostat. I also had the symptom of the engine temp swinging from hot to cold.
heater core possibly plugged and leaking
you are low on coolingliquid !
The front expansion valve is clogged.
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 heater core is blocked, or a heater hose has collapsed, keeping hot engine coolant from getting to the core. The "blend air" door may be stuck in the open position, keeping warm air from circulating, and dumping in cold outside air. I am assuming that engine coolant and water pump is good.
No, not if it's on a heat setting. Most home thermostats have a "Fan" setting that will blow cold air if the attic is cold.
you may not have the heater water hoses plugged in
You can not get heat from cold water, The engine has to run long enough to get the water in the engine HOT. That is were you get heat from HOT WATER-- Coolent
replace front heater corefront and rear have independent heater cores
Could be a number of reasons for this condition. I would check the coolant level. A low coolant level could cause your heater to blow cold air when the engine is warm. Is the engine warm? If the engine is fluctuating temp it could be a faulty thermostat. Hope this helps.
the heater core was stopped up just flushed it out ok now
You have run out of coolant, or the heater matrix is blocked.