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01-21-2013, 09:32 AM
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#1 |
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Registered User
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
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What is it?
This round vacuum canister on my firewall. What does it do and do I need it?
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01-21-2013, 09:36 AM
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#2 |
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Registered User
Join Date: Mar 2012
Location: edgartown mass
Posts: 852
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Re: What is it?
i think it is a vacum can. id you have ac then you should have one
__________________
1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car |
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01-21-2013, 10:20 AM
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#3 |
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Registered User
Join Date: Jun 2011
Location: Baytown TX
Posts: 2,219
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Re: What is it?
It is stored vacuum to control your blend doors fo factory a/c. If you have removed your factory a/c you dont need it.
Posted via Mobile Device
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John 82 Chevy Silverado 350ci/TH350 
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01-21-2013, 01:36 PM
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#4 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: What is it?
It's also a vacuum resevior for cruise control. I use mine only for cruise control.
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01-21-2013, 02:13 PM
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#5 |
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Registered User
Join Date: May 2010
Location: Lewis County, WA
Posts: 1,523
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Re: What is it?
That thing belongs in the circular file.
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'77 K35 - 454, SM465/NP205, 4.56 D60/14bFF |
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01-21-2013, 07:09 PM
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#6 | |
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Registered User
Join Date: Jun 2012
Location: Minnesota
Posts: 509
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Re: What is it?
Quote:
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01-22-2013, 09:22 AM
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#7 |
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Registered User
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
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Re: What is it?
I plan to keep the factory A/C.. Cruise will be aftermarket DD.. So does it just go to intake vacuum and thats it? Any check valve?
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01-22-2013, 09:31 AM
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#8 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: What is it?
Yes, it should have a while three nipple (ha ha I said nipple) check valve. It's right before the ball. It's on the vacuum hose to the intake. The ball is a vacuum reservoir. It should have vacuum on it all the time with the engine running if the check valve is working.
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01-22-2013, 09:42 AM
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#9 |
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Registered User
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
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Re: What is it?
So it has a T with a check valve and the T goes to intake And to that little vacuum line that goes through the firewall under dash?
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01-22-2013, 12:54 PM
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#10 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: What is it?
If I remember correctly, the big side is connected to the intake. the L end has one connection to the ball, the other to accessory line. Accessory line being cruise vacuum or vent actuator line.
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