Trans Conn Vac Switch ?
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Joined: Jan 2005
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From: Aylesbury Buckinghamshire. UK
Trans Conn Vac Switch ?
Can any experts out there tell me the purpose of the vacuum line from the vapour canister to a bulkhead switch ??.
My workshop manual tells me it a TRANS CONN VAC SWITCH.
The previous owner of my 80 changed the Rochester for a Holley 600 and left the upper hoses dangling. I guess they won't reconnect to the Holley as there is no provision for them. I can recover the hoses and the canister, but what was the function of that switch ?.
Thanks
Bob ( UK )
My workshop manual tells me it a TRANS CONN VAC SWITCH.
The previous owner of my 80 changed the Rochester for a Holley 600 and left the upper hoses dangling. I guess they won't reconnect to the Holley as there is no provision for them. I can recover the hoses and the canister, but what was the function of that switch ?.
Thanks
Bob ( UK )
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Joined: Dec 2002
Posts: 242
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From: Port Orchard Washington
In late 79 to 81 GM installed lock-up torque converters with TH350's. The converter was controlled by vacuum to a switch on the firewall. High vacuum in cruising gear (above approx. 15") would close the contacts and lock the converter.
