thermostat is stuck
With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
heater core could be rusty and old or line to heater core could be plogged most likely old heater core
Most likely cause is low coolant. Check your antifreeze level.
The heater does not blow air because it emits infrared rays that have heat molecules within them, thus releasing heat, not blowing it. A heater does not blow air becasue there is no moving air source within the heater. The heater emits infrered rays that cause heat to slowly flow out of the heater.
Yes.
Cause its broke!
It can, if the engine is not warming up.A definite maybe!Other causes might be:Plugged heater coreMalfunctioning temperature blend doorSee "Related Questions" below for more
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.
the blown head gasket would make it over heat. but it wouldn't cause the heater to blow cold, it should actually blow hot if that is wat happened
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
Leave it turned off.... doh