1985 Chevrolet C10 Cruise Control Help

white_knight · Mar 7, 2023

Would anyone be so kind as to help me on how to hook up my cruise control servo? The line circled in red runs to the vaccum supply tank if that's needed for the hookup, or is that only for the AC that hooks to the 2 way check valve? The line circled in blue is the one that I need to figure out how to hook up for the servo and does that need to be hooked to the intake or the 2 way check valve, or just a vaccum sorce?

Thank you

Matt69olds · Mar 8, 2023

There should be a check valve and a 3rd vacuum hose that goes to the vacuum storage tank.

Matt69olds · Mar 8, 2023

Read this:

Cruise Control Troubleshooting and Info

Long story short, I bought a simple lock up kit since my truck didn't have the system installed outside of the transmission. I replaced the wiring inside the transmission (Solenoid and pressure switch to the 4 terminal connector on the top... .it's a 700R4 btw). I ran the wiring up and through...

www.gmsquarebody.com

Trucksareforwork · Mar 9, 2023

The servo has two vacuum lines to it, one that goes to the vacuum tank you mention and one that goes through the firewall to the brake pedal cruise cancel switch.

There should be a three way check valve with one inlet on one side of the check valve coming from manifold vacuum, one down leg on the tank side of the check valve going to the servo, and the other leg on the tank side going to the vacuum reserve tank.

Here’s a picture of mine before I had the manifold inlet connected to the check valve.

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white_knight · Mar 9, 2023

Ok, thank so you much. Also, does this in anyway tie in with the vaccum line for the A/C or does that hook up separately?

Thank you

Snoots · Mar 9, 2023

You must be registered for see images attach

Matt69olds · Mar 9, 2023

I’m sure the climate control has its own check valve on the vacuum tank. Without the vacuum tank, every time vacuum falls off during acceleration, your cruise would stop working, and your air conditioning would start coming out the defrost vents.

Trucksareforwork · Mar 10, 2023

Matt69olds said:
I’m sure the climate control has its own check valve on the vacuum tank. Without the vacuum tank, every time vacuum falls off during acceleration, your cruise would stop working, and your air conditioning would start coming out the defrost vents.

I put a vacuum tee on the same tube as the cruise servo and ran my a/c vac from there. It’s behind the check valve and I never have a problem with a/c or cruise vac function. I had to go look. It doesn’t show in the photo I used because that was before I finished my install.

1985 Chevrolet C10 Cruise Control Help

white_knight

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Cruise Control Troubleshooting and Info

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