AC and heater case - #89022545

2005 CADILLAC STS
110,000 MILES • 3.6L • 6 CYL • RWD • AUTOMATIC
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BARNEYBODYSHOP
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  • 1 POST
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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May 6, 2017 at 8:54 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
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

May 8, 2017 at 5:28 PM
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