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Guys,

I am trying to test out the HVAC box before I put the dash in. Seems when the controls are in the "heat" position the dash vent door closes which would direct the hot air to the defrost duct. In the "Defrost" position, the door goes the other way and opens so the air would direct out to the dash duct.

The only thing I can think of is I have the red and white lines reversed on the vacuum servo (see pic). I am 99% sure I reproduced this correctly but I want to make sure. Can any body confirm this is either correct or reversed?

If this is correct, could a bad vaccum switch on the HVAC controls do this?? Car is a 1973 Charger w/ A/C. This should be the same for 71-74 B-bodies I'm thinking.

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I have a 78 B body. I have this:

lower-left, yellow
upper-left, red
upper-right, brown

I'm too tired to research at the moment, but thought this might help (I happened to have a picture of my HVAC box on my desktop). It's the same as yours, but they may have changed that one color over the years.

And shouldn't that be nylon tubing vs rubber hose? is that something you did? Maybe it got reversed on the other end.

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Got a service manual???

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Why , he has MOPARTS ...

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I have a 78 B body. I have this:

lower-left, yellow
upper-left, red
upper-right, brown

I'm too tired to research at the moment, but thought this might help (I happened to have a picture of my HVAC box on my desktop). It's the same as yours, but they may have changed that one color over the years.

And shouldn't that be nylon tubing vs rubber hose? is that something you did? Maybe it got reversed on the other end.

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Yes the colors did change. I have not brown lines. Just red, white, and yellow.

I have two original harnesses and yes, they are rubber lines. I did reproduce them from generic vaccum line but they mirror the originals.

JohnRR, when I find a paper copy of the service manuals that somebody isn't charging $60+ for, I will buy one.

In the meantime, I am assuming this means YOU have one and could have looked up the answer for me in the time it took you to post your non-constructive response.

Merry Chistmas!

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I have two original harnesses and yes, they are rubber lines. I did reproduce them from generic vaccum line but they mirror the originals.

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JohnRR, when I find a paper copy of the service manuals that somebody isn't charging $60+ for, I will buy one.

In the meantime, I am assuming this means YOU have one and could have looked up the answer for me in the time it took you to post your non-constructive response.

Merry Chistmas!

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You are spending HOW MUCH to restore your car and you can't spend $60 for a manual that will pay for it self many times over both in the information that is in it and the time you waste reading AND replying to non constructive replies ????

I was just responding to the guy that beat me to the non constructive reply ... ...

I don't have a manual for your 73 charger but I do have one for both my 69 super bee and my 69 dart , luckily it's the same book. I had one for a 68 Plymouth B body , included it with the car when I sold it , same with the 69 Plymouth manual when I sold my A12 Road runner.

I do have one for a 78 Plymouth, Dodge and Chrysler M body i'll sell you for less that 60 if it would help you out ...

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well, this is plymouth (sorry), but Dodge should be similar if not exactly the same

https://docs.google.com/open?id=0B7IYvy9_c_NLZXZnZXpnUHpFUWc
https://docs.google.com/open?id=0B7IYvy9_c_NLdDZtVUlENUJxTE0
https://docs.google.com/open?id=0B7IYvy9_c_NLSEtmTkttWjJkejQ
https://docs.google.com/open?id=0B7IYvy9_c_NLOTBRcWRsakNqNmM

if you can't view, try to download

edit - for some annoying reason, these links may not work in IE. if you want them directly, just send me your email. I don't want to post them as pictures because they will be shrunk

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JohnRR, when I find a paper copy of the service manuals that somebody isn't charging $60+ for, I will buy one.

In the meantime, I am assuming this means YOU have one and could have looked up the answer for me in the time it took you to post your non-constructive response.

Merry Chistmas!

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Get one of these. 30 bucks is money in the bank. You can print anything you need, download it onto your PC or laptop and leave the disk in a drawer.

http://www.faxonautoliterature.com/Search.aspx?c=37199

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Wow, are those your original lines? They look brand new! I looked high and low for new vacuum line that had the stripes and couldn't find any except maybe white on a chebby site.

I ended up just buying generic black vaccum line and using a paint pen to make a colored mark at each end of the line.

I have my original harness and an extra but I am just hesitant to re-use 40+ year old lines...

Very nice work!


I saw where you can buy the manual on CD. I kind of wanted the paper copy so I don't have to work off a laptop in the garage or keep printing pieces of the manual.

If this is on PDF, I wish somebody would just sell me the PDF for $10 or something instead of paying $30 for a CD with a PDF .

Moparmarks, the bypass door and defrost door will go back to their default posisitions in case of vacuum loss (takes a few minutes throgh check valve) but the blend door and fresh air door are going to stop wherever they were when the vacuum signal was lost? These two doors have a vacuum line to "pull" the door in each direction where as the defrost and bypass door have to have a constant vacuum to "hold" them in one position.

I have to say I am learning a lot about this. I am younger than most here (29) and what little I have done on auto HVAC has been on the new stuff which is electronic. Amazing how simple this stuff is and how much it can still do....

Hopefully now ready to get the dash in this weekend. I am going to see if I can pull the harness and wire the thing up on the bench. I feel much better now that the HVAC box seems to be working as it should!

Sorry for the questions but when I bought this car NOTHING worked and I pulled all this stuff out years ago so I don't have a reference to what I should be working towards sometimes.

Thanks for the help guys!