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Most likely a bad heater core
I am assuming you mean there is volume from the blower but it is cold. If so, First check your coolant level, if it is low the first thing to empty is the heater core. Check this and get back.
check your water...
The heater core may be stopped up. Try flushing it, or replace it.
lack of coolant, check for leaks.
its very hard to get to. if you look down the firewall on the left side. you have to remove the heat shield. i wound up dropping the exhaust and removing the exhaust manifold because its mounted under the water pump which is under the manifold.
here are a few causes why you do not get any heat. water pump faulty, restriction in cooling system, sticking thermostat
Friction causes heat. Heat is a source of energy.
They are threaded, but ypu need a special socket. Also, applying heat helps to loosen it, but they are tough to remove. Just unplug connector.
Low coolant level, internal or external coolant leak or faulty thermostat.
Probably a faulty temp blend door actuator.
You need to add water to the radiator, it may be low and you will overheat your motor.