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Climate control panel

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Varmint in your ductwork?
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
KRAMER0848
  • MEMBER
  • 4 POSTS
No varmint. Been doing this for 6 months. Always does it when you first start the engine, if you don't turn the a/c to max, it will stop in a few minutes.
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
I would guess hvac door cycling but you say it does it even OFF? That seems strange.
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
Either the hvac blend door aor temp door or something in the blower wheel. Un plug just the blower motor and see if you still hear it if you do start checking blend doors
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
BIGBACON
  • MEMBER
  • 2 POSTS
  • 2001 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 132,000 MILES
I have a 2001 impala and when I have the heater on it only works on defrost, when I move the selector to a different position it does not change. Any ideas what this might be?
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hello
Thanks for the donation

It sounds like you may have a vacuum leak. Check under the hood for a disconnected or damaged vacuum line. The controls are vacuum operated and if the vacuum supply is cut off the system defaults to defroster only. Some vacuum lines may also be located inside of dash.

Hope this helps.
Thanks for using 2carpros. Com!
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
BIGBACON
  • MEMBER
  • 2 POSTS
Ok checked all vacuum lines and they are all connected, and I cant see any cuts or tears in any of them, and as of 8 am saturday I am now getting a very low putout even though the speed selector is on 5
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
If no vacuum leak is present and the vacuum controlled motors in dash are operating, test the control switch itself. Ensure it is getting power and working properly as you switch through the speed settings.
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Wednesday, March 13th, 2019 AT 5:38 PM (Merged)

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