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No air out of vents - Fixed
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HotSauce6226
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PostPosted: Mon Aug 01, 2011 4:36 pm    Post subject:  No air out of vents - Fixed Reply with quote

Drove my Impala to St.Louis this week and on my way home, the air stopped coming out of the vents, just floor and windshield. I know thats usually a leak but do you know where I could start looking?
Does our cars have a vaccum ball?

3400 impala btw

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Last edited by HotSauce6226 on Wed Aug 10, 2011 3:24 pm; edited 1 time in total
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PostPosted: Mon Aug 01, 2011 5:03 pm    Post subject:   Reply with quote

probably the actuator that moves the door that determines where the air comes out of. Not an uncommon issue, seen it a few times on here

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HotSauce6226
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PostPosted: Mon Aug 01, 2011 8:45 pm    Post subject:   Reply with quote

Where is that at?

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HotSauce6226
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PostPosted: Sun Aug 07, 2011 12:24 am    Post subject:   Reply with quote

Any help? Are you talking blend door?

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billy101
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PostPosted: Sun Aug 07, 2011 3:05 am    Post subject:   Reply with quote

HotSauce6226 wrote:
Any help? Are you talking blend door?


I'm in the process of installing my Viper alarm/remote start and while I was under there, it looked to be like a little canister near where the ignition switch is. Take off the black panel, and the panel under the steering wheel and get under there you should see what I'm talking about...it's like 3" wide and has a vacuum tube attached to it, (I pulled it off and heard air being sucked in), which I'm guessing has something to do with the door actuator's because I think they're vacuum controlled in our cars. I've always had a problem getting my vent position to go top and bottom, lately it doesnt really do top and bottom...I can get top, Bottom, and defrost and bottom, but not really both top and bottom...if I wiggle the knob between top and bottom and put it to middle, it'll work; sometimes.

Sorry for rambling, I think we have similar issues...? Our issues might be related to that canister thing..possibly. Just trying to throw my input in here.
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Arvetus
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PostPosted: Mon Aug 08, 2011 10:31 pm    Post subject:   Reply with quote

the mode actuators are vacuum...the temp actuators are electric...I think.
The mode actuator might be stuck, or your vacuum line may have come off or is broken/cracked. Do you have any air coming out at all? Usually it will get stuck on one extreme or the other, likely a floor/defogger blend as if I remember right, that is the "default" position of the actuator.

It's possible the actuator itself is bad...it doesn't happen near as often on the vacuum controlled ones as it does the electric ones, but I too have seen it a time or two. If I recall, it is in the location where billy is referring to... I can't recall 100%...

It looks like this though:


**edit** It might also be worth your while to check the HVAC control head... you might have something lose there... I don't remember if there are vacuum lines on the mode selector or not ....

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Last edited by Arvetus on Mon Aug 08, 2011 10:54 pm; edited 1 time in total
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HotSauce6226
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PostPosted: Mon Aug 08, 2011 10:53 pm    Post subject:   Reply with quote

Glad you responded. Here is what happened.
Drove to St.Louis and went fine. Then 3 days later when we go to leave, a slight amount of air comes out of the vents, but you can hear/feel air from the defrost and feet.
We parked at a gas station for about 5 minutes still with the issue. Then I came back out and it was working fine, and did the whole way home.

Now its back to not working. I do get alil air out of it, but not nearly what I should be having, even at 5 speed. Im jsut trying to figure out where to look. I figured its vacuum related, but I cant see an issue anywhere. Any help is greatly appreciated.

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Arvetus
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PostPosted: Mon Aug 08, 2011 10:55 pm    Post subject:   Reply with quote

it does sound an awful lot like a vacuum leak ...
I'm trying to remember if the HVAC control head had a vacuum line(s) on it or not... I can't remember. Embarassed

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HotSauce6226
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PostPosted: Mon Aug 08, 2011 10:56 pm    Post subject:   Reply with quote

It has 2 lines that go TO it yes.
But im trying to think of where else to look.
http://chevroletforum.com/foru.....tor-20542/

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PostPosted: Mon Aug 08, 2011 11:25 pm    Post subject:   Reply with quote

Pretty sure BBE said something about a vacuum line under the hood somewhere but I don't remember fully.
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HotSauce6226
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PostPosted: Mon Aug 08, 2011 11:27 pm    Post subject:   Reply with quote

billy101 wrote:
Pretty sure BBE said something about a vacuum line under the hood somewhere but I don't remember fully.

I wish you could

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PostPosted: Mon Aug 08, 2011 11:29 pm    Post subject:   Reply with quote

HotSauce6226 wrote:
billy101 wrote:
Pretty sure BBE said something about a vacuum line under the hood somewhere but I don't remember fully.

I wish you could


Haha I wish I could too! I hate having either a freezing face or freezing feet! My a/c works SO damn good!

i'm going to look around on alldatapro real quick and see what i can find.

Here are the Vacuum Diagrams I was able to pull up off alldatapro.

HVAC Schematics: Air Delivery (CJ3)


HVAC Schematics: Air Delivery (C60)


Hope that helps you!
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Arvetus
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PostPosted: Tue Aug 09, 2011 11:17 am    Post subject:   Reply with quote

RE the knob on the HVAC control head, one line is probably the incoming vacuum line and the other is going back out...

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PostPosted: Tue Aug 09, 2011 2:41 pm    Post subject:   Reply with quote

Take this how you want it, but I seem to have fixed my issue. I have been having a problem with my PCV and crankcase vacuum. Read up and found out it's probably because I do not have a o-ring on my actual PCV Valve. Went out and bought the PCV Valve kit from AdvanceAuto for $21. Replaced it all. No longer have crankcase vacuum, (HUGE vacuum when you pulled off the oil fill cap; 3.8 N/A). I'm guessing the missing o-ring caused a huge vacuum leak. I fixed it, and now my modes; top and bottom and top only and bottom only switch almost immediately, and the middle selection now works! I dont know if this will fix your problem but since these are vacuum controlled you might want to look into it...
GOODLUCK!
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PostPosted: Tue Aug 09, 2011 4:56 pm    Post subject:   Reply with quote

good work billy, hope this resolves your issue!!

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