How to fix No Air from Vent / Vacuum / Intermittent AC Issue

Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby Broseph » January 21st 2017, 1:06am

Oh yeah, I replaced those too. But I was going to post about that on the other thread. As well as the window motor driver side. The only problem that remains with the fan/air is the sound from the dash on occasion. Kinda sounds like a little trap door opening and closing lightly.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby WimpTech » January 21st 2017, 1:18am

Defrost change over flappy thing perhaps? Vac ball should fix if its that thing
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby Leeann_93 » January 21st 2017, 1:53am

Jack up passenger side front. Pull wheel well liner. See this:

Image

That round thing is the vacuum ball.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby sixsix » January 21st 2017, 4:24am

Leeann_93 wrote:Jack up passenger side front....

She Speaks...


:poke:

Mike
Well, after all... what would Banacek say ?... “AOC - her astonishing matryoshka-like ignorance, like the rest of The Squad is surpassed only by the relentless idiocy of the democrats, antifa & it’s attendant mass media, mayors & governors.”


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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby sixsix » January 21st 2017, 4:29am

I dunno' - just cruisin' - didn't see you - but you been all over - Golly.

:banana:

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Well, after all... what would Banacek say ?... “AOC - her astonishing matryoshka-like ignorance, like the rest of The Squad is surpassed only by the relentless idiocy of the democrats, antifa & it’s attendant mass media, mayors & governors.”


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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby gordo999 » January 21st 2017, 8:45pm

Broseph wrote: The only problem that remains with the fan/air is the sound from the dash on occasion. Kinda sounds like a little trap door opening and closing lightly.

That's not a problem, it shows the system is working. There are trap doors operated by vacuum actuators. The trap doors do things like diverting air to the defroster vent, the floor heat vent, or both. Another diverts air from the outside. Another diverts warm air from the heater.

On my 2001 Safari, I had an issue where a door was colliding with another door and it could be rather noisy. I pulled it apart and re-aligned the doors. I don't recommend that unless it's absolutely necessary since it involves pulling apart a large amount of the dash.

If the trap door sound is fairly quiet, it should be OK.
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Don't neglect or forget the check valve !

Postby steve93101 » October 28th 2018, 11:27pm

After excruciating days chasing & replacing vacuum lines, looking under the dash etc. I finally replaced the check valve that runs from the vacuum canister reservoir. The check valve uses the reservoir & keeps vacuum in the system during acceleration / wide open throttle.

AC Delco.jpg
It is Vacuum Check Valve GM# 271



Dorman.jpg
Don't use the Dorman equivalent, it literally sucks does not seal as good !




valve.JPG
The hose on black part draws from the engine vacuum port, the split goes one each to the a. ball reservoir & b. controls under the dash.



Finally I use red (or any color) 3mm (1/8") Red Silicone Vacuum Hose spliced in to/or replace the hard plastic or rubber lines as needed.
600.jpg
It stretches quite a bit and will hold tight on a variety of nipples.The color really stands out and helps me keep track of the lines.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby mrc.engr » April 29th 2019, 8:26pm

The engine needs to be running to operate the vents, correct?[/quote]

Basically yes........the vents will work for a short period of time (2--3mins) after the engine is stopped because the vacuum will bleed-off as the vacuum system is not 100% sealed.


You hit the nail on the head Steve.......Dorman check valves suck. Get AC Delco (GM) original replacement # 15-5068 only.

Second thing that you did was excellent.......use a colored vacuum hose replacement so it's easy to see where it goes in all that dark engine area. I got three different silicone hoses. Yellow, blue and red. What a difference !!


steve93101 wrote:
After excruciating days chasing & replacing vacuum lines, looking under the dash etc. I finally replaced the check valve that runs from the vacuum canister reservoir. The check valve uses the reservoir & keeps vacuum in the system during acceleration / wide open throttle.

It is Vacuum Check Valve GM# 15-50568

Don't use the Dorman equivalent, it literally sucks does not seal as good !


Finally I use red (or any color) 3mm (1/8") Red Silicone Vacuum Hose spliced in to/or replace the hard plastic or rubber lines as needed.
600.jpg
It stretches quite a bit and will hold tight on a variety of nipples.The color really stands out and helps me keep track of the lines.


Leeann_93 wrote:Jack up passenger side front. Pull wheel well liner. See this:

Image

That round thing is the vacuum ball.


No need to pull the wheel....just turn it all the way to the right and remove front section of the mud flap by pulling the plastic pins that hold it in place. Right there in your face !! No jacking up the van or wheel removal needed.

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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby sixsix » April 30th 2019, 11:42am

Mike - you are a Posting Machine!
Thanks from ALL of us for your 11 years of Service here.

:banana: :banana: :banana: :banana:

Mike

5 Posts ... Goodness
Well, after all... what would Banacek say ?... “AOC - her astonishing matryoshka-like ignorance, like the rest of The Squad is surpassed only by the relentless idiocy of the democrats, antifa & it’s attendant mass media, mayors & governors.”


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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby srdragonusa » July 28th 2019, 9:42pm

Just Replaced this part, Controls now working. Now I think I need a new Blower Motor. It only works after I smack it with something heavy, not a hard smack. Not looking forward to cutting that plastic away.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby Leeann_93 » July 29th 2019, 12:55am

Why? Use a box cutter, cut on the lines. Takes under 5 mins.

When you install the new blower motor, put the piece of plastic you cut out back over the blower motor. All is well.

Oh, replace the blower motor resistor at the same time. Dunno which is the chicken or the egg, but one failing tends to bring down the other. You will need a 5.5mm socket or nutdriver.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby MechBob » July 29th 2019, 2:04am

^^^^^^^^^^^^^
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby vcbobw » September 16th 2019, 5:25pm

This worked perfectly on my 2000 Astro. Also needed to replace the other vacuum hoses in the engine compartments. Hoses and actuators other side of the firewall in the passenger compartment were all fine.

Thanks for the help!
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby AstroWill » September 17th 2019, 4:37am

vcbobw wrote:This worked perfectly on my 2000 Astro. Also needed to replace the other vacuum hoses in the engine compartments. Hoses and actuators other side of the firewall in the passenger compartment were all fine.

Thanks for the help!


Awesome, congrats on getting it fixed!

Yep, with the under-hood vacuum lines once you have to replace one, might as well replace them all.

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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby gordo999 » September 17th 2019, 7:54am

vcbobw wrote:This worked perfectly on my 2000 Astro. Also needed to replace the other vacuum hoses in the engine compartments. Hoses and actuators other side of the firewall in the passenger compartment were all fine.


That was the case with my 2001 Safari. The hose through the engine compartment had gotten too close to the exhaust manifold and it had dried and cracked. When I replaced it, I re-routed it so it was well away from heat sources.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby ariealwisenomad » March 20th 2020, 1:09am

Hey this is my exact problem except I can't find all the pics people are raving about!
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby AstroWill » March 20th 2020, 11:38pm


Trolls take away from productive work, best to starve the troll of attention by ignoring it and going about your business.
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby 81SAFARIMATT » March 30th 2020, 2:03am

ok ...first like all the others ...great post and thank you...

found the check valve... all 3 tubes coming off of valve were broken and about 2 inches long... found the ball and found the intake location... i am sure i looked at it several times but where EXACTLY is the tube coming thru the firewall located? is it just one tube? i seem to remember reading that there are 2...again i know how dumb i will feel when i actually find it ...please help me to be dumb...thanks...Matt
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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby Wiley » March 30th 2020, 3:25pm

Here is the rubber boot thing you mention with the 2 hoses, it is located top left of the opening to the engine bay. I did not investigate but it looks like the hose and boot may be 1 part molded together, so you might have to replace the whole thing with one from a junkyard.

IMG_20200330_074314397.jpg


IMG_20200330_074342250.jpg



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Re: How to fix No Air from Vent / Vacuum / Intermittent AC I

Postby 81SAFARIMATT » March 31st 2020, 12:31am

yeah ...I am dumb....thank you so much ... 2 tubes was the key...in my defense the hose needing replacing was broken right at the nub and it looked like just the one tube coming out ....thanks again ....Matt
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