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

Tiny
BKB1024
  • MEMBER
  • 1996 CHEVROLET CHEYENNE
  • 245,000 MILES
1996 chevy k1500. Heat and ac air ducts make a clicking noise continiously after opening or closing positions
Monday, June 4th, 2012 AT 11:53 PM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Are you talking about the recirculation door?
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Monday, June 4th, 2012 AT 11:57 PM
Tiny
BKB1024
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  • 3 POSTS
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?
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Tuesday, June 5th, 2012 AT 12:57 AM
Tiny
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.
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Tuesday, June 5th, 2012 AT 1:13 AM
Tiny
BKB1024
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  • 3 POSTS
Yes. It sounds like it changes tones and locations. Had to change fan switch. Burnt pin reversed polarity in switch
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Tuesday, June 5th, 2012 AT 1:20 AM
Tiny
SATURNTECH9
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Then sounds like the recirculation shaft could be broken.
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Tuesday, June 5th, 2012 AT 1:57 AM

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