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If you flushed the coolant with the thermostat in, chances are you didn't flush the coolant. Regardless, it's easiest to check the controls inside first. Does the blower fan work? Does the air flow change from floor to vent, to dash as it's supposed to? Does the A/C change temps when knob is turned from cold to hot? Post results.
most likely either the vacuum line to the round ball is disconnected allowing the vacuum pressure from moving the inner levers to the heating unit of ....check your radiator fluid levels to ensure they are to specifications level ...or you may need a radiator flush to flush the heater-core as they become plugged from gunk also could be the line going into the heater has become lose you will need to get involved a bit under the dash to investigate this ....also the switch could be bad or yes by all means use a test light and see if your fuse has blown it may be as well vacuum lines under the hood has dry-rotted preventing proper vacuum to the unit
but it sounds as if you need to have the heater core flushed these are the areas in which i would start with first ...good luck and i hope this helps you
A few things to consider when diagnosing poor heater
Flushing the radiator doesn't do much in terms of heat. The heater core should be flushed to get rid of anything accumulated in there over the years.
How hot is the engine actually getting? If the thermostat is stuck open the engine may never reach proper operating temperature.
With the engine at operating temperature feel the hoses going into the heater core, are they hot? Some vehicles use a heater control valve that only flows coolant through the heater core when activated. They work off of vacuum and it isn't uncommon to find a broken vacuum line at the valve.
Are the doors in the heater box operating correctly? Can you hear the heater door inside the dash open when you select heat?
I hope this helps in getting your heat to work for the upcoming season.
Two most common causes of your problem are low coolant ( air in the heater core) and a thermo stat stuck open. If you have a temperature gauge and it is reading on the low side. Like 140 Deg or less, you need a new engine thermostat. Feel the top of the radiator tank after the car has been driven. If it is too hot to touch, the thermostat is no the problem. As the system has been flushed and filled I suspect there is enough coolant. Last item on the list is the coolant valve for the heater core. Many cars have a water valve located in line with the supply pipe to the heater core. This valve may be in the engine compartment or under the dash. Check the heater temperature control and follow the cables. One cable most likly goes to this valve. Maybe a cable retaining clop has fallen off
Park your unit on a slight incline, start cold w/ radiator cap removed and interior heat on full bore. This will burp or release your air from your cooling system. Add 50/50 until radiator is full. When you replace any good amount of coolant in post 90's vehicles it must fill in that position. You also may have pushed some gunk around, flushing, clogging a water jacket or heater core. Hopefully helpful!!!!
Aside from flushing the radiator and heater core andreplacing your hoses, did you happen to replace your thermostat. Sounds to me like that's your problem if everything else seems to be in order. If you change the thermostat and still have no heat, you might check your vacuum lines running to the back of your heater controls inside your dash. That's really the only other thing that I believe could be causing your lack of heat.
Hope this helps! Have a great day and try to stay warm!