Ford Repair: temp control, vacuum leak, control question

Question
QUESTION: I have a 1997 Ford Ranger 4.0 when I turn down the temperature control it still blows hot air. If I turn all the controls off it goes off. The temp. control won't adjust the temp. of the air. Thank You.

ANSWER: Hello John, 1st pull the temp knob off and check to see if it is cracked. Gut feeling it is. Let me know Thanks Tony

---------- FOLLOW-UP ----------

QUESTION: I pulled the knob off it is ok, I can turn the stem  and it still blows hot air. Thank You.

Answer
Hello John, It may be the blend door motor or door broke in the heater case, also the radio coud be pulled to make sure you do not have a vacuum leak for the controls also. In order to check it you'll have to remove the radio,drop glove box down to see the top of the case. hope this helps Thanks Tony