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Remove the blend door accuator and move the door manually to check its operation. Check the splined where the shaft goes in the door and make sure the door is not cracked. If the door works correctly when you manually move it and the switch is new then you could have a bad accuator again but chances are its the door.
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okay I will click on the accept thanks for your help.
what could I use to turn the knob with out breaking any thing off.
if its the door what has to be ordered can I buy it from a junk yard and about what cost am I looking thanks