![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Junior Member
Join Date: Feb 2004
Location: WORTHINGTON,OHIO 43085
Posts: 26
|
Ac Control-how Many Vacuum Lines??
Hi Y'all
I Just Rebuilt An Ac Control Unit. I Noticed That One Unit That I Had Has 3 Connectors For The Vacuum Hoses To Connect To. The Other Unit (a Donor Unit-i Stole The Levers)has 2 Connectors For The Vacuum Lines To Connect To. My 1970 Chevy Shop Manual Shows The 2 Connector Style. Anyone Know How The 3 Connector Style Ac Control Unit Should Have The Vacuum Lines Routed?? Thanks, Mongo1957 |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
|
Re: Ac Control-how Many Vacuum Lines??
you can use either, but on the one with three ports will require that one be blocked off. Correct would be the one with two ports.
|
![]() |
![]() |
![]() |
#3 |
Junior Member
Join Date: Feb 2004
Location: WORTHINGTON,OHIO 43085
Posts: 26
|
Re: Ac Control-how Many Vacuum Lines??
Thanks Stope4-i'll Block Off The Third Port
|
![]() |
![]() |
![]() |
#4 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
|
![]()
Here is the vacuum diagram for the three port vacuum switch.
Jim |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Jan 2006
Location: Houston
Posts: 434
|
Re: Ac Control-how Many Vacuum Lines??
Jim, what is the specific year and vehicle for the diagram you show.
|
![]() |
![]() |
![]() |
#6 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
|
![]()
The schematic was in my Assembly Manual for the 67-72 trucks and there was no mention of the year. The (5) trucks, (70-72) that we have with AC have the two port control so my assumption is that the three port controls are from the 67-69 years. It could just be a difference in the assembly plants.
You may want to pose the question in a post! JIm |
![]() |
![]() |
![]() |
#7 |
Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,756
|
Re: Ac Control-how Many Vacuum Lines??
My '72 had the two port control. The replacement has three ports, but I haven't installed it, yet.
__________________
'05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|