Your heater core is plugged and you need a thermostat.
Check your heater hoses, that's where the water ciruclates into the heater from the water pump.
one large hose from bottom of radiator to side of water pump. other large hose from thermostat housing to top of radiator. one heater hose from water pump to heater core, I think this one has a Y in it if there is a rear heater other heater hose from heater core to somewhere on top the engine. If there is a rear heater, its return hose goes to a fitting on the radiator.
Upper and lower radiator, inlet and outlet heater core, bypass,Upper and lower radiator, inlet and outlet heater core, bypass,
the heater core has got a hole in it or your top has a hole init. If the water is green it is your heater core. if not it is your top.
With no water no heat can be transferred through the heater coils.
The heater core can be flushed out and hopefully be unclogged. A water hose can be hooked to the heater core hoses, and water flushed through to clean the core out.
Low water in the radiator will result in no heat. The water level is not sufficient to reach the heater core. The heater core will become cold.
It could be the thermostat. Open up the radiator cap when it is hot and see if the water is flowing in the radiator. If it is not then it may be a thermostat.
if you are talking about a radiator then yes it is supposed to stay on.
The port on top of the water pump (or on the side in some applications) is the coolant intake for the pump which coincides with the lower radiator hose. some people hook a heater hose to the intake and to the pump but doing this you are recirculating hot water from the heater core back into the engine as the water pump pushes water from front to back coming through the intake and out the upper radiator hose. so in this instance already hot water is going to the heater core and straight back to the engine without being circulated through the radiator also your water pump is essentially getting water from two sources. i normally plug the water pump and run a hose to the radiator and to the intake. there isn't anything wrong either way. one hose from intake to heater core and the second hose from the heater core to either water pump or radiator. one will take longer for the heater core to heat up but will ensure on a hot summer day all the coolant in the system is being cooled. with pump to intake setup the heater will work faster on a cold day but you may have cooling or overheating issues on a hot summer day.
Because you're in it.
You heater works from water flowing from your radiator to the heater core, you may have a leak in your heater core. You most likely also smell antifreeze inside the vehicle. It is most likely casued by a leaky heater core. Unfortunatly depending upon the make/model/year of your vehicle a heater core can be difficult and/or expensive to replace.
antifreeze is usually mixed 50 / 50 with preferably distilled water for your cooling system ( up to 60 % antifreeze if colder climate ) which includes the radiator , heater core , radiator hoses , heater hoses etc.
The heat for the interior of your car comes from the heated radiator coolant. When you are driving down the road the water pump circulates the heated engine coolant. If the engine slows and the water pump isn't real efficient you might get cooling in the heater. When you turn off the engine you aren't getting warm water pumped into the heater.
If you have replaced the water pump then flush the radiator with CLR also check to see if the fan is working properly.
Coolant flows into the water pump thru the bottom radiator hose, into the block from the water pump, up into the heads, and then to the intake crossover (or heater core from the back pass side head), then back to the radiator via the top hose. Coolant from the heater core is returned to the water pump not to the radiator.
check the antifreeze level in the radiator, when a heater blows cool/cold air there is not enough antifreeze/water in the radiator.
The heater core is part of the heating and cooling system, and it is the circulation of the radiator fluid that supplies heat to the core. The water pump on the car is what is responsible for the circulation of radiator fluid.
Check the heating elements in the water heater. These may be bad and need replaced.
1. If it loses coolant there is a pressure leak. The leak may be internal. 2. The radiator fan may not be coming on when it should. 3. The thermostat is stuck open or closed or has been removed. 4. Loose or broken fan belt. 5. The water pump doesn't work right. 6. The radiator or other parts of the cooling system (including heater radiator) are clogged
lack of proper care. lack of proper (distilled) water in the radiator.
The heater core is a small radiator inside the car under the dash that hot water circulates through to heat the inside of the car.
A heater core is a smaller version of the radiator that allows water used in the cooling system for the engine to be used to heat the interior of the vehicle.
The rear defrost is electric. The heater works off the hot water in your radiator running thru it and a fan blowing the heat into your compartment.. check your thermostat, it could be that your heater core isn't getting and water to it, that is were your car get's it't heat from, if not that it could be lack of water
could be a number of things radiator,thermostat,water pump heater core, low coolant old coolant bad hoses,