![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
|
Normal to hear vacume sound in AC controls?
Was working on my 84 the other day and noticed when the engine is running I am hearing what sounds like a vacume leak coming from the AC/heater controls. Can anyone tell me if that is normal or do I have a leak somewhere?
Any info is much appreciated. Thanks Scott
__________________
1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,188
|
Re: Normal to hear vacume sound in AC controls?
I have never heard a vacuum leak from A/C controls, but I do hear the vacuum actuators when they engage/disengage and occasionally hear a hiss when the A/C starts up. But if the A/C is functioning properly I would not be concerned about it.
|
![]() |
![]() |
![]() |
#3 |
Cruzzzn' Vet
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
|
Re: Normal to hear vacume sound in AC controls?
Normal
![]() |
![]() |
![]() |
![]() |
#4 |
Plays with trucks
Join Date: Sep 2003
Location: Asheville, NC
Posts: 433
|
Re: Normal to hear vacume sound in AC controls?
Try all of your heater/defrost/AC/vent functions. Could be an actuator (usually the blend door) going kaput. If it fails, no defrost.
__________________
Gary My Dad's Old Truck 1985 ![]() |
![]() |
![]() |
![]() |
#5 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
|
Re: Normal to hear vacume sound in AC controls?
thanks guys. I tried it on all settings, seems to be noticeable when in off position and a/c on, if heat or defrost r on I dont hear it. Defrosters r working but not very strong it seems.
__________________
1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
![]() |
![]() |
![]() |
#6 |
All About the BOWTIE
Join Date: May 2010
Location: Los Banos, California
Posts: 436
|
Re: Normal to hear vacume sound in AC controls?
Mine does that too... but if I wiggle it to the MAX, and back to OFF, the hiss stops.. mechanisms back there prolly just getting old and loose. It happens
__________________
CaliDude76 ![]() "... Being "SQUARE".. is where it's at...." ![]() Proverbs 15:30 .... "A Cheerful look brings joy to the heart, and good news gives health to the bones..." Be exceedingly blessed today, my friends!... |
![]() |
![]() |
![]() |
#7 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
|
Re: Normal to hear vacume sound in AC controls?
Swapped out the controller tonight with another I had in my parts stash and the vacume sound is gone. Also it seems that the defrosters r noticeable stronger. No way to see if there is any change in AC since it isnt working yet. Just wanted to update everyone.
Scott
__________________
1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
![]() |
![]() |
![]() |
Bookmarks |
|
|