The blend door control works in every position except dash vents when switched to A/C or vent?

1998 FORD MUSTANG
121,000 MILES • 3.8L • V6 • 2WD • MANUAL
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98STANGCOUPEV6
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I know ya'll are getting tired of this question but, I've got the car listed above coupe, blend door control works in every positing except dash vents when switched to A/C or vent. Floor works as does defrost. Using diagrams, I found on here I've traced down all vacuum lines and repaired the ones loose or broken. Still having the issue with no air coming out of dash vents when I switch the selector to A/C or vents?
Sep 20, 2023 at 10:34 AM
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STRAILER
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It sounds like you have a blend door pivot that has come loose internally. Let's try turning the system on and working the blend doors by hand to see if you can get the air to blow out from the vents. Here are the locations so you can check it out. Please check out this guide:

https://www.2carpros.com/articles/low-or-no-air-flow-from-vents

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Sep 21, 2023 at 12:52 PM
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98STANGCOUPEV6
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I'll update soon.
Sep 22, 2023 at 4:24 AM
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STRAILER
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Please do!
Sep 23, 2023 at 10:48 AM
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98STANGCOUPEV6
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Sorry, but with work and "other" projects to finish I haven't had the chance to get back to this. I hope to get into again this coming weekend.
Sep 27, 2023 at 4:11 AM
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STRAILER
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Yep, there is no shortage of things to do that's for sure, let us know when you need help or you have results.
Sep 28, 2023 at 9:50 AM
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98STANGCOUPEV6
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I know there is still a vacuum leak, I'm just having a hard time finding it. I think it's time to get a smoker machine and see where the leak actually is for sure.
Sep 30, 2023 at 11:22 AM
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STRAILER
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It might be a control valve issue, or you have a broken vacuum line under the hood. please go over this guide to see what I am talking about:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Please go over this guide and get back to us.



Oct 2, 2023 at 9:53 AM
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RICHARD SMITH6
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I'm 98stangcoupev6, I put a vacuum smoker on it in a few different places, no leaks found in engine area or under the dash. At this point I'm thinking it could be the selector switch itself.
Oct 25, 2023 at 4:19 AM
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STRAILER
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Yep, they do go bad, here is how to replace it. Check out the images (below). Please let us know how it goes.
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Oct 25, 2023 at 8:12 AM
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RICHARD SMITH6
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Front end parts on their way in right now. Heater works great, so the A/C and selector will have to wait until springtime. Updates around that time. Decided to fight one battle at a time. :)
Nov 4, 2023 at 12:25 PM
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RICHARD SMITH6
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still working on this, but it'll have to wait until warmer weather, no shop. Will update then.
Jan 29, 2024 at 5:42 AM
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STRAILER
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Sounds good. Please start a new thread for the front end repairs if needed.
Jan 29, 2024 at 9:58 AM