your heater core could be plugged check to see if the two hoses coming from the firewall of the car are hot if the top one is hot and one is not the core is plugged
if it has rear heat--it has hoses and a heater core for the rear heating system--could be any of this
That really depends on what you are trying to heat and how you are heating it.
First you need to make sure it is actually not heating up. Do this by checking to see if the radiator hoses are getting warm after running for 10-15 min. Be careful they could be HOT. If the hoses are hot then the heater core is plugged and will need to be replaced. If hoses do in fact not get hot then the thermostat is most likely stuck open. removing it will tell the tale.
Active Solar Heating and Passive solar Heating.
Heating vents should be placed on or near the floor because heat rises. In rising, it will warm the air of the room. If the heating vent were near the ceiling, the room would stay chilly, even though heat was being poured into it.
During an emergency. i.e. when the heat pump is not working. If your heat pump can not keep your house warm, then the auxiliary heating coils (same thing as emergency heat) will come on automatically. If not, then there is a problem with your heating system.
Heating vents should be located near the floor since hot air rises. If the heating vents are located near the ceiling the heat would stay there and not warm the room.
this is the second motor in this car with the same radiator/hoses and still no heat. can the heater core be a problem or maybe the radiator hoses?the car does not over heat.or can it be the part bolted onto the fire wall where the hose goes into?someone please help me.
Heating vents should be placed near or on the floor in a room because heat travels up not down.
Check the heater hoses on the right side of the engine. If one hose is hot and the other is not , you might have a blocked heater core. Or the blend door actuator might not be operating correctly.
It would be better to place the heating vent near the floor because the heat will travel up and down, so that way the room would be heated evenly. If you place it near the ceiling, the heat would not heat the floor that well, since the heating vent sucks back in the heat
If you are getting a little to no heat, mostlikely the Heater core is clogged. Disconnect heater hoses by the alternator. Higher hose is the input and lower hose is output. Back wash the heater core with garden hose or compressed air. I actually connected the hoses backward to circulate the coolant in reverse flow. Usually get a good heat after this. I would correct the hoses in correct order after a good flush of the cooling system.