Author Topic: Ac blend door actuator knocking  (Read 3524 times)

Offline jptiger

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Ac blend door actuator knocking
« on: November 28, 2017, 10:58:31 AM »
On passenger side under glove box. Which acuator is this? This is on 92 GMC Sierra k1500. Thank you happy holidays 


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab

Offline VileZambonie

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Re: Ac blend door actuator knocking
« Reply #1 on: November 28, 2017, 06:26:11 PM »
Does it only do it when it reaches its final position? When you change it does it stop?

It's most likely the actuator motor is broken but you need to remove it to check it. See the attached pic.

PS - non 73-87(91) vehicle questions go in General Discussion which is why it was moved.

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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline jptiger

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Re: Ac blend door actuator knocking
« Reply #2 on: November 30, 2017, 11:04:07 AM »
Thank you this is big help


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab

Offline jptiger

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Re: Ac blend door actuator knocking
« Reply #3 on: November 30, 2017, 11:06:18 AM »
When I go from defrost to floor it knocks. Go from floor to defrost it stops.


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab

Offline VileZambonie

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Re: Ac blend door actuator knocking
« Reply #4 on: November 30, 2017, 04:28:14 PM »
That's mode not blend
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              ⌠¯¯¯¯¯'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Irish_Alley

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Re: Ac blend door actuator knocking
« Reply #5 on: December 01, 2017, 10:04:42 AM »
my 94 will do this sometimes. almost like the motor itself shuts the door then the last inch it just slams it just once. or does it click multiple times?
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline jptiger

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Re: Ac blend door actuator knocking
« Reply #6 on: December 04, 2017, 09:23:28 PM »
Multiple times. Rick/flap sound. About 20 times then it stops. Driving me nuts


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab

Offline jptiger

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Re: Ac blend door actuator knocking
« Reply #7 on: December 04, 2017, 09:23:56 PM »
Excuse me. Tick/ flap sound.


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab

Offline jptiger

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  • Husband of Kim father of Joshua
Re: Ac blend door actuator knocking
« Reply #8 on: December 04, 2017, 09:26:01 PM »
I know this is a 92 and I apologize I just needed some help. Thanks


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1977 GMC Sierra Grande K15 swb
1992 GMC Sierra K1500 ext cab

Offline VileZambonie

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Re: Ac blend door actuator knocking
« Reply #9 on: December 05, 2017, 06:04:08 PM »
The image shows you where the mode door actuator is. What other help are you looking for?
,                           ___ 
                         /  _ _ _\_
              ⌠¯¯¯¯¯'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Irish_Alley

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Re: Ac blend door actuator knocking
« Reply #10 on: December 06, 2017, 06:26:03 PM »
im with vile. sounds like the actuator broken. i picked one up from the junkyard years ago to replace mine and its still going.
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes