why does the air duct motors keep running and clicking after opening and closing

1996 CHEVROLET CHEYENNE
245,000 MILES
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BKB1024
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1996 chevy k1500.heat and ac air ducts make a clicking noise continiously after opening or closing positions
Jun 4, 2012 at 11:53 PM
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SATURNTECH9
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Are you talking about the recirculation door?
Jun 4, 2012 at 11:57 PM
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BKB1024
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i think so.i can feel the clicking behind blower motor.i can feel doors openong and closing,but motor acts like it wont stop trying to open or close.does it have a limit switchor what tells it to stop??
Jun 5, 2012 at 12:57 AM
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SATURNTECH9
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So if you change from recirculation to open air does the noise change?It sounds like you may have a broken recirculation door shaft.The recirculation door uses a actuator that depends on the resistance of the door when it reaches its stop toshut off.
Jun 5, 2012 at 1:13 AM
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BKB1024
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yes.it sounds like it changes tones and locations.had to change fan switch.burnt pin reversed polarity in switch
Jun 5, 2012 at 1:20 AM
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SATURNTECH9
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Then sounds like the recirculation shaft could be broken.
Jun 5, 2012 at 1:57 AM
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