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08-14-2010, 03:18 PM
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#1 |
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Truck Junkie
 
Join Date: Aug 2008
Location: Lithia Springs Ga
Posts: 354
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Vacuum line help
Can anyone give me a quick lesson on where and how the vacuum line run to get vacuum into the cab and up to the a/c and where they attach. The PO on my 85 seems to have had 2 hobbies. 1 cutting wires and 2 pulling vacuum lines. Any help would be great...thanks greg
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08-15-2010, 09:24 AM
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#2 |
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Senior Member
Join Date: Feb 2010
Location: Maumelle, AR
Posts: 478
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Re: Vacuum line help
The vacuum feed came off the intake and went through the firewall to the heat/AC controller. But from there they go to all the dampers in the duct work and kick panels. Best thing to do would be to find a schematic diagram for them. Unless you know someone that has a truck the same as yours you could use as a go-be.
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08-15-2010, 01:48 PM
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#3 |
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Truck Junkie
Join Date: Aug 2008
Location: Lithia Springs Ga
Posts: 354
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Re: Vacuum line help
Thanks, i may try to google it greg
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08-16-2010, 10:13 PM
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#4 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Vacuum line help
i think i got a pic
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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08-17-2010, 07:01 AM
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#5 |
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Truck Junkie
Join Date: Aug 2008
Location: Lithia Springs Ga
Posts: 354
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Re: Vacuum line help
thanks man every little bit helps...
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08-19-2010, 05:30 PM
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#6 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Vacuum line help
these are ones i have now ,will check but it looks like it goes to the vapour can,and i think it's the same line coming in over the heater box
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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08-19-2010, 05:45 PM
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#7 |
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Truck Junkie
Join Date: Aug 2008
Location: Lithia Springs Ga
Posts: 354
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Re: Vacuum line help
thanks these will help alot
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08-19-2010, 10:46 PM
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#8 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Vacuum line help
quick question is it tbi?
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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08-19-2010, 11:13 PM
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#9 |
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Registered User
Join Date: Sep 2009
Location: Van Buren, AR
Posts: 321
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Re: Vacuum line help
Looks Like It
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 Drive It Like Ya Stole It '82  Primer White c10 2wd LWB 350 sbc t350 (Hot Rod) '90 2wd LWB Silverado 350 tbi 700R4(Daily Driver) '53 m38a1 Willys Jeep (Toy) |
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08-20-2010, 05:27 AM
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#10 |
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Truck Junkie
Join Date: Aug 2008
Location: Lithia Springs Ga
Posts: 354
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Re: Vacuum line help
No it is a carb thanks again
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08-20-2010, 06:49 AM
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#11 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Vacuum line help
dam hoped it was tbi,seems my truck shouldn't be
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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