1984 C10 Vacuum question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ndbrownknives · 12-03-2010, 06:00 PM

Hello all. I am new to the site and was reffered by my local auto part store mgr. I have an '84 LB 2WD AT 305ci. I had to redo all of the vacuum lines when I got the truck which I was able to get straight from a vac diagram, but I have two vac switches on the fire wall I can't figure out what they do. There is one vac switch on each side(passenger/driver) of the firewall. Each has a vacuum nipple on one side and two wires plugged into the other side. Does anyone know what these do and where they should attach to vacuum. Any help would be huge. Thanks to all of you.

CaliDude76 · 12-03-2010, 08:56 PM

Pix would help...

ndbrownknives · 12-04-2010, 02:53 AM

Here are pics of each. Thanks for the help.

big_b · 12-04-2010, 03:00 AM

the one on the drivers side is the vacuum switch that controls the torque converter lock up or overdrive and the one on the passenger side controls the computer.

ndbrownknives · 12-05-2010, 02:31 PM

Awesome thanks. Do you happen to know where each vacuum side(of the switches) should attach to a vacuum source?

12-03-2010, 06:00 PM	#1
ndbrownknives Registered User Join Date: Nov 2010 Location: Tucson, Arizona Posts: 5	1984 C10 Vacuum question. Hello all. I am new to the site and was reffered by my local auto part store mgr. I have an '84 LB 2WD AT 305ci. I had to redo all of the vacuum lines when I got the truck which I was able to get straight from a vac diagram, but I have two vac switches on the fire wall I can't figure out what they do. There is one vac switch on each side(passenger/driver) of the firewall. Each has a vacuum nipple on one side and two wires plugged into the other side. Does anyone know what these do and where they should attach to vacuum. Any help would be huge. Thanks to all of you.

12-03-2010, 08:56 PM	#2
CaliDude76 All About the BOWTIE Join Date: May 2010 Location: Los Banos, California Posts: 436	Re: 1984 C10 Vacuum question. Pix would help... __________________ 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!...

12-04-2010, 02:53 AM	#3
ndbrownknives Registered User Join Date: Nov 2010 Location: Tucson, Arizona Posts: 5	Re: 1984 C10 Vacuum question. Here are pics of each. Thanks for the help. Attached Images

12-04-2010, 03:00 AM	#4
big_b Registered User Join Date: Oct 2010 Location: Capital City B.C Posts: 59	Re: 1984 C10 Vacuum question. the one on the drivers side is the vacuum switch that controls the torque converter lock up or overdrive and the one on the passenger side controls the computer.

12-05-2010, 02:31 PM	#5
ndbrownknives Registered User Join Date: Nov 2010 Location: Tucson, Arizona Posts: 5	Re: 1984 C10 Vacuum question. Awesome thanks. Do you happen to know where each vacuum side(of the switches) should attach to a vacuum source?

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