Vacuum Can - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jeepster376 · 04-14-2004, 10:11 PM

I have the vacuum canister mounted on the heater box, I think I see it on mos AC equipped trucks. Mine has a vacuum line running from the manifold to the can and that's it. What could this be accomplishing hooked up like that. What is the proper connection?

**smitty62** · 04-14-2004, 10:13 PM

That's it

Longhorn Man · 04-15-2004, 07:19 AM

Jeepster, is there another nipple on the vac can?

Jeepster376 · 04-15-2004, 12:14 PM

It's difficult to tell, there is some kind of knub I can feel on the back side, but I don't think it's an opening. It just seems like such a little can connected only to the manifold, can't be doing much of anything.

**smitty62** · 04-15-2004, 12:37 PM

It's a vacuum reservoir--all it does is maintain vacuum to activate the heater/ac controls!

Jeepster376 · 04-15-2004, 01:41 PM

Yes but it needs to connect to something. I took a closer look and found that, that knub I felt was in fact another nipple, and I found the little vacuum line had fallen off that goes into the vacuum switch on the Heat/AC controller.

Longhorn Man · 04-15-2004, 04:12 PM

The interesting thing about those is, if you don't have a check valve, I don't see how they can do anything.

jhow66 · 04-15-2004, 11:40 PM

check valve inside

04-14-2004, 10:11 PM	#1
Jeepster376 Registered User Join Date: Feb 2004 Location: Massachusetts Posts: 269	Vacuum Can I have the vacuum canister mounted on the heater box, I think I see it on mos AC equipped trucks. Mine has a vacuum line running from the manifold to the can and that's it. What could this be accomplishing hooked up like that. What is the proper connection? __________________ 72 Cheyenne Super 4x4 SWB

04-14-2004, 10:13 PM	#2
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	That's it __________________ Stepsides look like real trucks! Smitty

04-15-2004, 12:14 PM	#4
Jeepster376 Registered User Join Date: Feb 2004 Location: Massachusetts Posts: 269	It's difficult to tell, there is some kind of knub I can feel on the back side, but I don't think it's an opening. It just seems like such a little can connected only to the manifold, can't be doing much of anything. __________________ 72 Cheyenne Super 4x4 SWB

04-15-2004, 12:37 PM	#5
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	It's a vacuum reservoir--all it does is maintain vacuum to activate the heater/ac controls! __________________ Stepsides look like real trucks! Smitty

04-15-2004, 01:41 PM	#6
Jeepster376 Registered User Join Date: Feb 2004 Location: Massachusetts Posts: 269	Yes but it needs to connect to something. I took a closer look and found that, that knub I felt was in fact another nipple, and I found the little vacuum line had fallen off that goes into the vacuum switch on the Heat/AC controller. __________________ 72 Cheyenne Super 4x4 SWB

04-15-2004, 07:19 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Jeepster, is there another nipple on the vac can?

04-15-2004, 04:12 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	The interesting thing about those is, if you don't have a check valve, I don't see how they can do anything.

04-15-2004, 11:40 PM	#8
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	check valve inside __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer



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