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Air conditioning not blowing though the vents

This is a discussion on Air conditioning not blowing though the vents within the General Help forums, part of the LSx Technical Help Section category; Air conditioning not blowing though the vents. compressor is turning. when I pull back the carpet just under the dash ...

  1. #1
    Member qwik219d9's Avatar
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    Air conditioning not blowing though the vents

    Air conditioning not blowing though the vents.

    compressor is turning.

    when I pull back the carpet just under the dash I feel cool air coming in on the pass.side

    I am also getting cool air though the defrost.

    maybe the ducking up to the vents in dash wiggled loose I was thinking about removing the plastic cover just under the glove box and inspecting.

    I'm not sure how to remove this covering.

    any tips is appreciated. how to links w/ images would also be a big help.

    did a little net research could be a vacuum check valve located near the PCM
    attach image can't attach so here's a link

    http://www.car-stuff.com/pontiacheatervalve.htm
    Last edited by qwik219d9; 04-09-2011 at 09:12 PM.

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    Senior Member justinmc978's Avatar
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    sold: 1999 firebird
    1998 Trans Am

    a friend of mine had the same problem on his Camaro and replaced his HVAC controls, (the box all the AC/fan knobs are on) worked like it should after that, you might look into it.

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    **Te@M fBoDy** fbodyNATION's Avatar
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    did u mess with anything under the hood lately? sometimes the vacuum lines can get broken by mistake & this would cause the a/c not to blow through the vents,but blows everywhere else,this happened to me before,or sometimes the hvac control panel malfunctions & will cause it to do that also hope this helps,& I hope you can get the problems resolved

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    Senior Member bills98ta's Avatar
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    Ya, check that little vacuum line that goes to the back of the intake from the heater box location...

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    Member qwik219d9's Avatar
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    Quote Originally Posted by justinmc978 View Post
    a friend of mine had the same problem on his Camaro and replaced his HVAC controls, (the box all the AC/fan knobs are on) worked like it should after that, you might look into it.
    I hope it's not the control box, did you'r friend swap it w/ a used one?

    Quote Originally Posted by fbodyNATION View Post
    did u mess with anything under the hood lately? sometimes the vacuum lines can get broken by mistake & this would cause the a/c not to blow through the vents,but blows everywhere else,this happened to me before,or sometimes the hvac control panel malfunctions & will cause it to do that also hope this helps,& I hope you can get the problems resolved
    I haven't messed w/ any thing under the hood lately besides the usalle oil check.

    well I do know that when I turn on the control nob for AC on I hear the AC compressor kick in. so that alone would problably rule out the control box.

    Quote Originally Posted by bills98ta View Post
    Ya, check that little vacuum line that goes to the back of the intake from the heater box location...
    I will check that small hose this morning.
    this small hose can feel w/ my hand behind the manifold while the manifold is still on I believe I can however when I did my manifold swap I remember leaving the large vacuum line attached can't remeber about the little tube.

    I'm hopping it's the 3 way check valve cracked either way these vacuum lines can be a real PITA I have replaced the line from the DR. head Y-d behind the
    pass. head up to PVC.

    so I'll probabley redo these small lines now thay are 11 years old.

    hopefully it's be a $5. fix

    PS I have been told that if the refregirant in the AC is lower than normal this alone will cause same problem, I haven't had any refregirant added in about 5-6 years. however I don't use the AC much at all. untill the outside air temps are what they are now 85 +

    Thanks Guys for advice
    Last edited by qwik219d9; 04-10-2011 at 05:22 AM.

  6. #6
    Member qwik219d9's Avatar
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    Quote Originally Posted by bills98ta View Post
    Ya, check that little vacuum line that goes to the back of the intake from the heater box location...
    I'm not sure what the heater box is are you referring to the heater core inside the pass. area ?

  7. #7
    Senior Member justinmc978's Avatar
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    sold: 1999 firebird
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    Quote Originally Posted by qwik219d9 View Post
    I hope it's not the control box, did you'r friend swap it w/ a used one?
    yeah he did, got it from a local wrecking yard

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    Senior Member Lunatikgixxer's Avatar
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    ill post a pic up. mine did this after i installed the cam and the vacuum line came out

    This tiny line in here. It might be a little harder to find in your car since i didnt tuck it back up where its suppose to go.

    Last edited by Lunatikgixxer; 04-10-2011 at 06:55 AM.

  9. #9
    Member qwik219d9's Avatar
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    I inspected around the 3 way valve did'nt really see any abvious worn out or cracked 3 way valve.

    dam these cars ar a PITA just to even inspect. my observasions where these tiny vacuum lines are inside a eletrical wiring conveluted tubing dam it's allready tight enounght now I have to inspect inside an electrical tube.


    Nonday I'll see if I can feel back behind the manifold.

    why do I allways have cars that are a major pain even on little stuff?

    PS I haven't noticed any power loss. seams like normal minus the AC

    thanks Guy's
    Last edited by qwik219d9; 04-10-2011 at 12:01 PM.

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    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by bills98ta View Post
    Ya, check that little vacuum line that goes to the back of the intake from the heater box location...
    Exactly what I was thinking. I messed mine up when I did my intake swap and had to fix it. Problem solved after that.

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    You can buy a small mirror on a telescoping handle that allows you to view behind the intake manifold. Point a flashlight at the mirror and poke it back there -- works like a charm.

  12. #12
    Member qwik219d9's Avatar
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    Quote Originally Posted by justinmc978 View Post
    yeah he did, got it from a local wrecking yard
    can you ask him how much $ he gave for the controller?

    also are all 4th gen firebirds controllers interchangable?

    Quote Originally Posted by Lunatikgixxer View Post
    ill post a pic up. mine did this after i installed the cam and the vacuum line came out

    This tiny line in here. It might be a little harder to find in your car since i didnt tuck it back up where its suppose to go.
    Click for full size
    Click for full size
    thanks for posting image my 3 way valve has never been touched it's located right in front of the slite on the black plastic piece.
    Quote Originally Posted by Y2KPewterSS View Post
    Exactly what I was thinking. I messed mine up when I did my intake swap and had to fix it. Problem solved after that.
    my manifold has been on for about 6 years, I just noticed the no AC coming though face vent last week.

    BTW very nice camaro I really like the CCWs exspecially the 295s on the rear. how are you liking those BF goodrichs?
    I've been running the BF sports for a while and they have been on National backorder for months I'm I'm concidering other tires.

    Quote Originally Posted by pajeff02 View Post
    You can buy a small mirror on a telescoping handle that allows you to view behind the intake manifold. Point a flashlight at the mirror and poke it back there -- works like a charm.
    excellent suggestion.
    even though I did'nt observe any obvious cracks during the initial inspection think I'll replace these valve since I have read a few simiarl posts on this AC face vent issuse.

    I've also read about the vacuum tube under the battery box get worn out quick due to battery acid however this thread was on a 3rd gen.

    Where is a good place to splice in a perament vacuum guage



    Thanks Guy's
    Last edited by qwik219d9; 04-11-2011 at 02:18 AM.

  13. #13
    Senior Member JayTA98's Avatar
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    have you check to make sure the 3 way valve is not bad/stuck?

  14. #14
    Member qwik219d9's Avatar
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    Quote Originally Posted by JayTA98 View Post
    have you check to make sure the 3 way valve is not bad/stuck?
    actualley I cruised by a Advance auto store

    I should have wrote down the AC delco part # because the parts folks there did'nt have a clue.

    I will swap this inexpensive part out Tuesday (if I can get it locally).

    as far as inspecting behind the manifold I would prefer to avoid that.

    Thanks Guy's

  15. #15
    Member qwik219d9's Avatar
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    I will swap this valve out today.

    I hope there will be intructions on how to install it.

    exactly where are these 3 lines connected to?

    I know one goe's to the manifold I believe another runs up near the battery?

    https://www.napaonline.com/Catalog/Result.aspx

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    I believe one goes to the MAP sensor or a manifold vacc source, the other to the cruise control and the other comes through the fire wall to operate the HVAC gate controls..
    :\Users\Steven\Pictures\d6ftg5nh.gif


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    Member qwik219d9's Avatar
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    yes I believe you are correct on where these lines are connected.

    AC face vent issused resolved w/ $5. part. I'm happy.

    1.for the past 5 years when outside air tep. gets above 90 degrees my stock alternater loses effeiciency. (it's 11 years old at 110K miles) like when I'm at a red light w/ AC on and radio (playing low Volume) V guage will go low as low as 9 V (w/ fog lights on) even lower to 8V, so some stuff must be turned off sometimes everything.

    cooler temps like 80 and lower no problem what so ever steadie charge at 12-13V I have sean other folks cars charging higher w/ same stock alt.

    2.also I have'nt added any freeon to the AC sys for I few years about 5 or more. maybe I should have the level checked?
    edit I hardly ever even use the AC. expect once a month year round for lubing it up.

    Thanks

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