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05-28-2018, 02:04 PM
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#1 |
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Registered User
Join Date: Jul 2015
Location: Alberta
Posts: 161
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AC vacuum control head Q.
By design should the ac vacuum controller switch hold vacuum in the ac position even when the truck is shut off? Mine doesn't , I am trying to test to see if the switch is leaking.
My engine doesn't make a bunch of vacuum and when I am doing some spirited driving (ac on) my vac canister doesn't have enough supply to keep my heater valve closed. When the truck is idling or cruising I have enough vacuum to keep it closed. I have confirmed my canister holds vacuum, no leaks at the heater or door vent diaphragms.I have the 2nd vac port on the head plugged. Last edited by Trackman101; 05-28-2018 at 02:16 PM. |
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05-28-2018, 02:45 PM
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#2 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: AC vacuum control head Q.
Quote:
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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05-28-2018, 03:42 PM
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#3 |
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Registered User
Join Date: Jul 2015
Location: Alberta
Posts: 161
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Re: AC vacuum control head Q.
I have the stock vacuum canister. It works as it should. I can't seem to find anyone who sells just that vacuum switch.
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05-28-2018, 04:45 PM
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#4 |
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Senior Member
 
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,859
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Re: AC vacuum control head Q.
What port are you getting vacuum from on the carburetor, or are you getting it from the intake manifold? Can you show a picture of where the vacuum line is connected to the engine? Do you think the vacuum switch on the A/C controller is leaking because you hear a hiss from it, or do you think something else is going on?
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05-28-2018, 05:47 PM
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#5 |
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Registered User
Join Date: Jul 2015
Location: Alberta
Posts: 161
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Re: AC vacuum control head Q.
I've isolated down to the vacuum switch. Now to track one down without having to buy the whole a/c heater switch assembly.
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05-28-2018, 09:28 PM
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#6 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: AC vacuum control head Q.
Manes truck parts use to have them.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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05-28-2018, 11:11 PM
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#7 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,676
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Re: AC vacuum control head Q.I
I've bought the vacuum switch from local AC shops that have a parts department open to the public. Even at retail, they aren't that pricey.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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06-01-2018, 09:01 AM
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#8 |
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Registered User
Join Date: Jul 2015
Location: Alberta
Posts: 161
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Re: AC vacuum control head Q.
I struck out trying to find just the vacuum switch. I did score an ol ac/heater switch assembly for cheap and stole the vac switch off of it. I've got it back together yesterday and tested. This morning the system is still holding vacuum. Fixed!
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