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You have one of two problems. The heater core is plugged /
restricted or there is an inoperative internal blend door motor problem. Start the vehicle and let it reach operating temperature. Feel the hoses under the hood that go into the heater core. They should be close to the same temperature. If one is hot and the other luke warm/cold.... the heater core is plugged/restricted. If both hoses are near the same temperature, suspect a defective/non operational blend door motor that controls heat/cold/airflow attached to the heater box assembly
check to see if you've blown a fuse. In most cars the fuse box is right near the driver's seat, usually somewhere in a corner under the dash. they're little things so use those tweezers that are in there. the heater should be one with a high value. I have an assorted bag of these in my glove compartment. Easy and quick to fix it you've done it before. Your owners manual will tell you where that fuse is. Also, many cars label the holes where the fuse goes as to what it protects. Some of the little box covers have diagrams on them. You'll need that little flashlight.
could be your heater core, um try checking the heater assembly in the dash, something may have broke so the heat isn't being switched over, and it is staying on cold. Regularly check the fluids in the motor and top up as needed
Assuming your interior control is actually good and your temperature select is actually working, the most probable problem is the valve on the heat supply line to the Heater core in the engine compartment. Check the valve on the 1" line going to the firewall from the engine. That is the heat supply line for the heater core. If that isn't opening correctly you are getting any heat from the motor to your heater core causing your problem. This is normally vacuum controlled but occasionally is cable controlled. If it is vacuum controlled and not functioning check your vacuum lines for leaks and breaks.
if the heater hoses going in and out of the heater core are hot, then your temp blend door is not moving to allow heat from the heater core into the car. either the temp knob or blend door motor is bad. some are vacuum, some are electric.