Vacuum line routing

Vacuum line routing

Postby eurostl [OP] » November 2nd 2010, 1:36am

We have a 2000 AWD panel van with a bog in acceleration with anything more than light throttle application.
We looked at vacuum hoses and found all were deterorated or not plugged into anything. Searched everywhere for
a diagram, found none and replaced what we could figure on our own. The vacuum ball has the nipple broken off,
so we will find one of those tommorow. We still aren't sure we have the new hoses hooked up right. The one to
the intake manifold we ran back to the valve with two other hoses, one to the ball and the other to right under cowl.
Anyone have a clear diagram or know how these should be routed?
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Re: Vacuum line routing

Postby unrreal » November 2nd 2010, 3:08am

here is the diagram you asked for:
astro vacuum diagram.jpg
astro vacuum diagram.jpg (133.24 KiB) Viewed 8857 times
Attachments
vacuum_check_valve.jpg
you are gonna need a three way check valve
vacuum_check_valve.jpg (33.46 KiB) Viewed 8857 times
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Re: Vacuum line routing

Postby eurostl [OP] » November 2nd 2010, 8:42pm

Thankyou very much from "unreal" for the vacuum diagram and picture of check valve connections.
This sure helped. You would think with only a few lines we could figure it out, but not exactly.

The ses light came on again and code is for maf problem. We are going to try cleaning it first
before we replace the maf. Any suggestions?

Thanks
Mike
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Re: Vacuum line routing

Postby chevy57bert » November 2nd 2010, 8:49pm

more vacuum lines (99 Astro /Safari)

99 vac lines safari.gif
99 vac lines safari.gif (85.43 KiB) Viewed 8841 times
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Re: Vacuum line routing

Postby eurostl [OP] » November 2nd 2010, 10:57pm

Thankyou "chevy57bert" for the added info for the hvac control unit etc. We now have air going to the floor and dash vents
and not just to the windscreen. We have disconnected the maf and now the truck runs fine with no sag in acceleration at all.
We aren't sure that we need a new maf, or if maybe we have a wiring issue. Let us know if you have any ideas please.

Thanks
Mike
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Re: Vacuum line routing

Postby astroturf » November 2nd 2010, 11:46pm

Mike,

Glad you got the Vac Problem fixed.

Sounds like you might have another problem though.

Maybe time to start another topic.

My two cents, Jim
Last edited by chevy57bert on November 2nd 2010, 11:49pm, edited 1 time in total.
Reason: quote
My Cup is neither half empty nor half full... But has a hole in it. Holy Cup Holders Batman. LOLz, Jim
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MAF sensor cause bog in acceleration?

Postby eurostl [OP] » November 3rd 2010, 11:14pm

Thanks for all the help on our vacuum issues. We still have the bog in acceleration on anything aggressive.
Code for maf activates and if we disconnect maf wires, the van runs well. What do you think?
We can replace maf but not sure we don't have wiring problem. Any suggestions?
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Re: Vacuum line routing

Postby wings515 » October 11th 2011, 6:15pm

I am new to this forum and noticed I have the same problem as some of the other folks. When climbing a hill, all air flow stops. I located the check valve and will replace it but during the investigation, the vacuum line going towards the Right front wheel area seems to be dried out. Can someone direct me to a picture as to where this line terminates? The picture in the previous post stops shy of the end point of this line.
I figure while I am replacing the check valve I might as well replace the line.

The picture of the check vlave was a tremendous help. I found it in less than a minute.

Thanks to all that submit answers.

Regards,
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Re: Vacuum line routing

Postby Phantom » October 12th 2011, 11:29am

Did you see where the vacuum reservoir is? the ball on the lower right hand side, scroll up the page a little higher
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Re: Vacuum line routing

Postby wings515 » October 12th 2011, 3:44pm

Thanks, had to double click the picture to see the complete area. That ball must be the vacuum tank.

Regards,
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Re: Vacuum line routing

Postby wings515 » October 13th 2011, 7:12pm

Jacked the vehicle up and removed the splash shield. Disconnected the rubber hose from the vacuum tank and went to the check valve. Removed the hose from there and what a mess. The hose was dried out and powdery. Installed new hose and now blower air remains constant as I climb hill.

This 20 minute job has made a vast improvement in the climate control. I suspect it will also help in fuel economy since I no longer have a vacuum leak.

Thanks to all,
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Re: Vacuum line routing

Postby Lumpy » October 14th 2011, 1:36am

Whoever invented vacuum is a big buttissimo.. :doh:

I hate that system. Dozens of connections, little valves and vents, big
storage balls and cannisters. Several sizes of hose. All the hoses crack and
go bad in places that you can't easily see. And when they are bad, it's really
hard to tell, most of the time. When it goes bad, your performance suffers
or worse.

Vacuum makes me ... :crying:


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Re: Vacuum line routing

Postby Jasen » October 14th 2011, 1:46am

Lumpy wrote:Whoever invented vacuum is a big buttissimo.. :doh:



Vacuum makes me ... :crying:


Lump



Soooo, who invented space. I hate when I get a rip in my space suit and my blood boils from the vacuum of space :mrgreen: :lol:
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Re: Vacuum line routing

Postby Lumpy » October 15th 2011, 12:38am

Yeah, that too. And to think we've got that circulating around our engine compartment.
Surely that's dangerous. One false move and your blood boils.

Vacuum - :banghead:


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Re: Vacuum line routing

Postby Jasen » October 15th 2011, 12:46am

You should always wear proper clothing when working with vacuum.

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Re: Vacuum line routing

Postby fasteddy » October 17th 2011, 1:24am

That suit won't work. The joints are not constant volume, and the suit will lock up in vacuum.

It ain't the vacuum y'all hate, it's the containment mechanism. I've come from Nippon stuff, and the vac lines we saw held up for 200k miles, easy. I've got a Montero with 350k on it and the lines are all original. I'm going into my 99awd with annealed copper and japanese rubber. No more breakamatic hard plastic and crackomatic rubber for FE. I fought that demon for too many years in the old K5.

After all, Nature abhors a vacuum....
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Re: Vacuum line routing

Postby sausagefingers » May 18th 2012, 2:43am

So what's the best way to get to the manifold to put a new line on? And can you get this plastic line at the auto parts store? Or do you have to order it from GM?
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Re: Vacuum line routing

Postby Phantom » May 19th 2012, 3:07pm

sausagefingers wrote:So what's the best way to get to the manifold to put a new line on? And can you get this plastic line at the auto parts store? Or do you have to order it from GM?

Remove engine cover to access manifold, rubber vacuum lines are better than the plastic ones ,
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Re: Vacuum line routing

Postby Jasen » May 19th 2012, 4:48pm

:goodpost:
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Re: Vacuum line routing

Postby kkesler » July 20th 2012, 1:34pm

unrreal wrote:here is the diagram you asked for:
astro vacuum diagram.jpg


Where, exactly, does the hose coming out of the vacuum check valve drop down to? Replaced my check valve yesterday and found that long line is in horrible shape. Followed it down with my hand as far as I could and didn't reach the end.

<edit> And what size is it, while we are at it. Need to go to the part store and don't want to have to take that nasty thing with me.
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