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its happen because heater core have too much durt insaide and you can clean it with some blowing thing or replace

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Q: Why would there be no coolant flow from engine to heater core on 2000 Elantra if there are no obstructions?
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If the heater core is not replaced can it cause damage?

If your heater core is LEAKING engine coolant so that your engine coolant level drops too low or the engine coolant is lost completely and causes your engine to overheat then your engine can be damaged beside the mess the leaking coolant makes inside your vehicle ( you might be able to just temporarily bypass the heater core so that no engine coolant is flowing through the heater core )


Will low coolant cause a cars heater to not work?

Yes. The coolant carries the engine heat to the heater core. Without coolant the heater core does not get warm.


Where is the heater core temperature thermostat?

The temperature of the coolant entering the heater core is controlled by the engine thermostat. The engine coolant thermostat is generally located at the engine end of the upper radiator hose.


Heater blowing out cold air?

Check the radiator for full coolant. Check the engines water pump and thermostat, as the engine coolant carries heat from the engine into the heater core.


Why would the heater in a 1997 Hyundai Elantra start blowing cooler air?

check your coolant level. most times its from a coolant leak in the system.pressurize the cooling system to find the leak.


Is it safe to drive a car when the coolant tube is leaking inside?

No , this coolant is coming from your heater core and you are losing engine coolant ; you need to have this repaired because the engine will overheat and suffer damage that will be more expensive than the repair of the heater core .


Why is coolant leaking from the heater drain line on the engine firewall of a Pontiac sunfire?

heater core has a leak replace heater core


Do block heaters and coolant heaters work the same?

yes in a way. block heaters heat the coolant in the block there for warming the block up. coolant heaters heat the coolant out side the engine like in the hoses and radiater. and when the coolant gets hot enough it opens the thermosate and starts flowing through the engine..The coolant heater should be hooked into the engine so that it heats only the engine and the heater core. If the coolant heater is trying to heat the radiator then it will not work very well to heat the engine, you would need a lot of BTUs to heat the radiator as it will shed all that heat to the air that is surrounding it.


Why no heat in cab of f350 diesel?

no heat can be caused by,blocked heater core insufficient coolant in engine blocked heater hoses from engine to heater core bad heater thermostat bad thermostat in engine bad heater control switch


What is the cable with a wall plug in on it on engine of a 2002 Chrysler Sebring?

That is an engine block heater. It heats the engine coolant.


Why do you plug in diesel engine?

The "plug" powers an coolant heater. A diesel engine starts easier if the engine is warm.


Where is the drain hose heater jeep?

The heater uses the engine coolant to heat the vehicle. The radiator has a drain petcock along the bottom edge to drain the coolant system.