If the heater core in your vehicle goes out, you will not be able to use your heater or defroster. You will also notice the smell of antifreeze throughout the vehicle and possibly a film on the windshield from the antifreeze.
Generally the coolant goes in the bottom of the heater core and out the top only because the coolant makes less noise this way if there happens to be trapped air in the system, otherwise it doesn't matter.
there is a hose that goes to the block and one that goes elsewhere, there is a small stem and a larger one that is coming out of the heater core which one goes where
One goes from the heater core to the water pump, the other goes from the heater core to the intake manifold.
It leaks coolant.
Nothing
No, it is commonly done when heater core goes south.
YOU CAN'T, you will have to replace the heater core itself with a new one.
it is essentially a tiny radiator. hot coolant goes in and heats up the fins in the heater core and your fan blows air through the heater core thus heating up the air and you.
Generally the return line.
you have no heat and car runs normal
it is essentially a tiny radiator. hot coolant goes in and heats up the fins in the heater core and your fan blows air through the heater core thus heating up the air and you.
No. The top hose goes to the engine. The bottom hose feeds from the engine to the heater core back to the radiator.