Engine Compartment Help

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85K10

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James
Truck Year
1985
Truck Model
K10
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5.0
I recentley purchased an 85 K10 from its original owner. While looking under the hood i notices a switch on the firewall that has a hose on it. The hose is disconnected. I was wondering of someone could tell me what it is and maybe where it should be connected. Factory 305 motor. See Pics.
 

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bucket

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That's for the lock-up on the torque converter, the vacuum line should just go to straight manifold vacuum I believe.
 

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