Answers: the heater spout is under the hood close the fire wall on the passenger side follow the heater hoses until you find the stopcock. mark it near a pen or chalk and turn the knob to hot again. did it move? you can also disconnect the cable or linkage from the valve and try totally carefully to move it to another position, consequently try the heat coming out of your vent. one more entity to do is while the cable is off of the stopcock, again turn the knob, if it is still stiff, the cable/linkage is frozen- if it is smooth and easy, the spout could be frozen.
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