Air cleaner vacuum lines

Chumley · January 1st, 2007, 05:47 PM

Here's another one for you guys. I know how a thermastatic controlled air cleaner works. On this '72 model, it is currently not hooked up. The vacuum line from the manifold to the little plastic fitting which routes the vacuum to the thermastatic sensor is missing. There are 2 hose fittings on this piece. Where do the hoses go from this location? I'm used to there only being one, which would go to a manifold vacuum source. Until I get my assembly manual, I'm in the dark on some of this stuff. Thanks in advance.......Chumley

Chumley · January 2nd, 2007, 10:19 AM

Thanks, There is already a line going from the sensor to the diaphram on the snorkel, as well as one going from the sensor to the part I was describing that has 2 vacuum fittings on one end, and 1 fitting on the other end(which goes to the sensor) I guess I could hook up a line to each and see if they both work or not, then plug the other one. All the other GM's I've owned just had one vacuum hose going from the intake to the sensor, then one hose from the sensor to the diaphram. OR, I could skip the middleman and just hook it up directly to the manifold. Since I'm running this motor stock, it would sure help on the cold mornings if this system was functional.

Chumley

Oldsguy · January 3rd, 2007, 07:00 AM

Sounds like there are two different sources for vacumm depending on engine conditions. I have never seen one like that though, especially on an older car. Is it possible that the previous owner neeeded to replace the lower air cleaner housing for some reason and got one from a newer car which uses computer control and two different sources of vacumm???? Just a thought.

January 1st, 2007, 05:47 PM	#1 (permalink)
Chumley Registered User Join Date: Dec 2005 Posts: 217	Air cleaner vacuum lines Here's another one for you guys. I know how a thermastatic controlled air cleaner works. On this '72 model, it is currently not hooked up. The vacuum line from the manifold to the little plastic fitting which routes the vacuum to the thermastatic sensor is missing. There are 2 hose fittings on this piece. Where do the hoses go from this location? I'm used to there only being one, which would go to a manifold vacuum source. Until I get my assembly manual, I'm in the dark on some of this stuff. Thanks in advance.......Chumley

January 3rd, 2007, 07:00 AM	#3 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	Sounds like there are two different sources for vacumm depending on engine conditions. I have never seen one like that though, especially on an older car. Is it possible that the previous owner neeeded to replace the lower air cleaner housing for some reason and got one from a newer car which uses computer control and two different sources of vacumm???? Just a thought. __________________ Dan '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

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January 2nd, 2007, 10:19 AM	#2 (permalink)
Chumley Registered User Join Date: Dec 2005 Posts: 217	Thanks, There is already a line going from the sensor to the diaphram on the snorkel, as well as one going from the sensor to the part I was describing that has 2 vacuum fittings on one end, and 1 fitting on the other end(which goes to the sensor) I guess I could hook up a line to each and see if they both work or not, then plug the other one. All the other GM's I've owned just had one vacuum hose going from the intake to the sensor, then one hose from the sensor to the diaphram. OR, I could skip the middleman and just hook it up directly to the manifold. Since I'm running this motor stock, it would sure help on the cold mornings if this system was functional. Chumley