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Sounds like the problem lies in the thermostat, When the engine thermostat fails to close fully, the engine coolant temperature may fall. Low engine temperature causes several problems and may cause the heater to blow cool air. Make sure about that.
if the fan blower is working then it must be the heater valve inline with the heater hoses. Or the selector on the dash has broken and is not connected at the back. You have tried everything else. You were correct in what you wrote above and have tried so far
check to be sure that the thermostat is closing, sounds like yours is stuck open, which happens a lot ,, if the water won't stay in the motor long enough to heat,, then you won't get any hot air coming out , follow the top radiator hose to the motor, under that housing is where you will find the thermostat , thay are pretty cheap, less than 10 bucks normally ,, I'd just replace it
first check to see that you coolant level is full, check it after the engine has cooled down,so there is no pressure in the system. otherwise you possibly have a head gasket in the early stage of failure
Most likely your thermostat has failed and is stuck open. Engine coolant goes through the heater core and is used to heat the air that is blown into the cabin. If the thermostat fails, the coolant doesn't stay inside the engine long enough to absorb enough heat to make the climate control air blow hot. Change your thermostat (flush the coolant and have it replaced while you do this), and you should be back in business.
possibly the heater valve isn't opening allthe way,or the thermostat is stuck open not letting engine coolant get hot, check to make sure both heater hoses on firewall are hot, then if you have a small wooden mallet(not steel or metal) tap the thermostat housing and see if this dislodges thermostat from being stuck, don't hit it real hard, the housing is only aluminum
first check and if the thermostat is working. take it out put it in hot water. the thermostat should open up. also put a temp gauge in the hot water so you know at what temp it opens up. start there. dont forget theres more fuses under the hood for the ac unit