| Two Rubber Hoses [message #362450] |
Fri, 19 February 2021 19:45  |
Melbo
Messages: 144
Registered: August 2018
Location: Albuquerque NM
Karma: 0
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I have two rubber hoses going through what I would call the "firewall". One hose is connected to a vacuum switch (or air switch) activated by the brake pedal. I'm sure that is for the cruise. The other hose is cut off under the dash and also cut off in the engine compartment. I was going to remove it and use the opening for routing wires from the engine compartment to the dash. If that hose served a valuable function and should be replaced and connected it would be helpful to know how and where it should be. If it is unnecessary I will remove it. Hard to guess what is what from October of 1973 and who knows how many owners and friends of owners that changed and modified things before I started.
TIA
Melbo
Albuquerque NM Bus Conversion 1978 MCI 1973 GMC
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| Re: Two Rubber Hoses [message #362453 is a reply to message #362452] |
Sat, 20 February 2021 10:41  |
Melbo
Messages: 144
Registered: August 2018
Location: Albuquerque NM
Karma: 0
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Bruce
I do believe that you have answered my question. That makes sense because that is where the old air compressor was.
Matt
I'm sure you can confirm that as well.
I no longer use the original air pump so I can do what I want and put some wires through that opening.
Thank You
Melbo
Albuquerque NM Bus Conversion 1978 MCI 1973 GMC
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| Re: [GMCnet] Two Rubber Hoses [message #362455 is a reply to message #362454] |
Sat, 20 February 2021 19:16 |
Marsh Wilkes
Messages: 155
Registered: January 2004
Karma: -3
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Had me going too. I'm thinking it must be like thermal idle control.
I remember my 70 GTO 455 would speed up the idle cyclically while idling
with the AC
running on a hot day, at the time I didn't know for sure what it was or how
it was done.
If I have it right now, it's a temperature controlled vacuum leak that revs
the engine, fan,
water pump to prevent over heating. I'm sure Matt or someone will speak up.
Marsh Wilkes
Perry Fl
-----Original Message-----
From: Bruce Hislop via Gmclist
Sent: Saturday, February 20, 2021 11:46 AM
To: gmclist@list.gmcnet.org
Cc: Bruce Hislop
Subject: Re: [GMCnet] Two Rubber Hoses
Matt,
I can usually follow your acronyms or Google them. You got me on the "TIC"
valve though. Google didn't come up with anything that makes sense in
this context.
Can you help me out with what a TIC valve is? I suspect its the cruise
release valve on the brake peddle but I can't figure out the acronym.
Inquiring minds want to know!
Thanks
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| Re: Two Rubber Hoses [message #362471 is a reply to message #362469] |
Sun, 21 February 2021 21:10 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Engine vacuum to the heater control might pass through there.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Two Rubber Hoses [message #362480 is a reply to message #362450] |
Mon, 22 February 2021 07:36 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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TLAs can be troublesome if everyone doesn't use the same argot.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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