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AC and heater case - #89022545

Tiny
BARNEYBODYSHOP
  • MEMBER
  • 2005 CADILLAC STS
  • 3.6L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 110,000 MILES
Each time car is started I hear a buzzing noise, that lasts about sixty seconds, under the dash. It appears that there are three levers, shown in illus. Parts no. 30, 29, and 27. Part no. 30 is not connected to Part no. 29 and it seems that is what is causing the noise. I can touch Part no. 29 and the noise stops. I do not know if Parts nos. 29 and 30 are broken, or have just come apart, or maybe a part is missing? These parts/noise are under the dash on the driver's side of the A/C heat case.
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Saturday, May 6th, 2017 AT 8:54 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,909 POSTS
Hello,

This sounds like the blend door actuator is going bad and needs to be replaced. Here is a guide that will help you get the problem fixed.

https://www.2carpros.com/articles/replace-blend-door-motor

Please let us know what you find ;)

Cheers, Ken

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Monday, May 8th, 2017 AT 5:28 PM

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