You assume correctly, the coolant always flows through the heater core. It is the vent controls that dictate hot or cold air gets through to the vents.
Does the heat come out of both sides of the console? You may need VIDA/VICE scanner to check the climate control system, unless you have manual climate control. If it is a manual system, the cables may be binding up. The electronic system could have a problem if both sides push out warm air. If it is only one side, it may be a vent control motor is not returning to completely closed. The only way to find out is to pull the kick plate down from the dash, remove the vent motor and check the vent action.
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Keeping it running is better than buying new
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