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Air coming out of the defrost???

 
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Albert2kls
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PostPosted: Fri Aug 05, 2011 11:16 am    Post subject:  Air coming out of the defrost??? Reply with quote

When I am using the AC at night, I notice the windshield frost up but I have it on the vent setting. I put my hand on the defrost vent and I have a Decent amount of air coming out. Is that a blend door issue?
Thanks in advance for your input

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HotSauce6226
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PostPosted: Fri Aug 05, 2011 4:15 pm    Post subject:   Reply with quote

I have same issue

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BlackVenom
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PostPosted: Fri Aug 05, 2011 8:31 pm    Post subject:   Reply with quote

Same here night/morning. it doesn't get too bad though..

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billy101
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PostPosted: Fri Aug 05, 2011 9:30 pm    Post subject:   Reply with quote

Same here, just happened on the way home from work.
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IffyG
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PostPosted: Fri Aug 05, 2011 10:33 pm    Post subject:   Reply with quote

I'm pretty sure it's normal. Just about every car I have driven will fog up on the exterior of the glass on the windshield when it's super humid outside.

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Arvetus
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PostPosted: Mon Aug 08, 2011 10:39 pm    Post subject:   Reply with quote

if a good amount of air is coming out your defrost vents when you have it set on dash vent, that is a problem and is not normal. You might get a tiny bit, enough to fog it up, but it shouldn't be a lot and you wouldn't even be able to tell if you put your hand up there. There is likely an issue with your mode actuator motor (vacuum powered) or the door itself that routes where the air goes. The mode actuator is vacuum controlled and is accessible by removing the knee/kick panel, and is your most likely culprit. Be sure to also remove the metal piece after you take the plastic cover off... you should be able to get to it from there... it's been some time since I have had my car and had that taken apart Smile

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HotSauce6226
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PostPosted: Mon Aug 08, 2011 10:49 pm    Post subject:   Reply with quote

Have you seen an issue with mode actuator motor?
Im having a similar issue. You can see my thread about it. Please. THanks

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billy101
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PostPosted: Mon Aug 08, 2011 10:51 pm    Post subject:   Reply with quote

Arvetus wrote:
if a good amount of air is coming out your defrost vents when you have it set on dash vent, that is a problem and is not normal. You might get a tiny bit, enough to fog it up, but it shouldn't be a lot and you wouldn't even be able to tell if you put your hand up there. There is likely an issue with your mode actuator motor (vacuum powered) or the door itself that routes where the air goes. The mode actuator is vacuum controlled and is accessible by removing the knee/kick panel, and is your most likely culprit. Be sure to also remove the metal piece after you take the plastic cover off... you should be able to get to it from there... it's been some time since I have had my car and had that taken apart Smile


I had a feeling that's what that canister thing was with the vacuum tube attached to it! What does it mean when I cannot get my position to Top and Bottom? If I put it to floor only and then quickly to middle it'll work, but not really. If I simply just switch it straight to top and bottom it will take hours to switch over.
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Arvetus
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PostPosted: Mon Aug 08, 2011 11:01 pm    Post subject:   Reply with quote

sounds like a vacuum leak or a malfunctioning actuator for sure...check all the vacuum lines to and from the actuator and they're only $30 if you wanted to replace it. I don't know how easy or hard they are to replace...I'd have a look in my car, but I've not had the impala since October ... and I am not having any luck finding any write ups on replacement procedure to post here for y'all... Sad

I've replaced 2 actuators in my Tahoe in the last 8 months, but they are electric and are a different animal than the vacuum....

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HotSauce6226
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PostPosted: Mon Aug 08, 2011 11:03 pm    Post subject:   Reply with quote

All I have is this on a blend door
http://chevroletforum.com/foru.....ala-25592/

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Albert2kls
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PostPosted: Tue Aug 09, 2011 7:45 am    Post subject:   Reply with quote

The knee/kick panel under the steering wheel it where the actuator is?
Thanks

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Arvetus
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PostPosted: Tue Aug 09, 2011 11:09 am    Post subject:   Reply with quote

I believe that is where the mode actuator is...yes. At least that's what I remember from the last time I had the dash apart when I had the car. I can't verify for sure because I don't have the car anymore and there is very limited info on it that I can find.

Hotsauce, the hot/cold actuator you linked to is a totally different animal...and there are boo-koo writeups on replacing those. They are electric and easy to troubleshoot. If it works, it works, if it doesn't, replace it Smile The Vacuum actuators are a bit more difficult because you have to ensure there isn't a vacuum leak as well as ensure the device actually functions.

I wish I could be more help and hope I'm not actually hindering your progress...

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