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68 charger vacuum squealing #3095396
11/19/22 12:24 AM
11/19/22 12:24 AM
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Sonoran desert, Arizona, USA
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moparjo68 Offline OP
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It may be a common problem, but its new to me. I have a vacuum leak from somewhere under hood. It sounds like its coming from all over. Hard to pinpoint. I thought maybe the coffee can/vacuum reservoir can had a pin hole leak in it so I bypassed the hoses going into it but the vacuum squeal was still there. So I ruled that out. Now the squeal noise will go away when I switch on the headlights. Turn off the headlight switch, the squeal noise comes back. So does anyone know where the noise/leak may be coming from?

Re: 68 charger vacuum squealing [Re: moparjo68] #3095399
11/19/22 12:41 AM
11/19/22 12:41 AM
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Park Forest, IL
slantzilla Offline
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Hide away headlight mechanisms?


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Re: 68 charger vacuum squealing [Re: slantzilla] #3095446
11/19/22 10:32 AM
11/19/22 10:32 AM
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Moparite Offline
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You have vacuum canisters with diagrams in them to work the headlight doors. One side opens the door and the other closes it. You have a vac leak somewhere in the close vac line or it's the canister itself.

Re: 68 charger vacuum squealing [Re: Moparite] #3095468
11/19/22 11:56 AM
11/19/22 11:56 AM
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Originally Posted by Moparite
You have vacuum canisters with diagrams in them to work the headlight doors. One side opens the door and the other closes it. You have a vac leak somewhere in the close vac line or it's the canister itself.


I would agree with the above but clarify it's likely one on the vacuum pods/actuators (likely what he meant) as the cannister(under the battery tray) is under vacuum at all times.

Might try disconnecting one side at a time to isolate which side and then proceed with a hand held vacuum pump. I would not ASSume it's the cannister/pod until confirming with the pump wink beer

Re: 68 charger vacuum squealing [Re: TJP] #3095471
11/19/22 12:12 PM
11/19/22 12:12 PM
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Jefferson State
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srt Offline
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A tool to isolate (small kitchen funnel and a piece of fuel line). Fuel line to ear and funnel directed at suspect vac leak.
Another method I've used is get the noise generating and pinch off the various vac lines gently with a pair of pliers.
I tend to agree one of the vac motors may have a ruptured diaphragm. Much like a blade of grass held between thumbs, as air flow goes past it vibrates causing the noise.

Re: 68 charger vacuum squealing [Re: srt] #3095524
11/19/22 02:27 PM
11/19/22 02:27 PM
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another thing to look closely at, are the nipples the vacuum hoses attach to.
i have seen them have a small crack, causing the whistle as well.
it shouldn't be too hard to track down.
please let us know what you find.
beer

Re: 68 charger vacuum squealing [Re: moparx] #3095598
11/19/22 06:55 PM
11/19/22 06:55 PM
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Jefferson State
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Originally Posted by moparx
another thing to look closely at, are the nipples the vacuum hoses attach to.
i have seen them have a small crack, causing the whistle as well.
it shouldn't be too hard to track down.
please let us know what you find.
beer

Good point. A little contact adhesive is a good way to insure no leaks.

Re: 68 charger vacuum squealing [Re: slantzilla] #3108571
01/04/23 07:26 PM
01/04/23 07:26 PM
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Sonoran desert, Arizona, USA
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moparjo68 Offline OP
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UPDATE............UPDATE.....................UPDATE.....................UPDATE................ Yes. Its the headlight actuator vacuum pod on passenger side. Its got a vacuum leak. So I looked on Year One and they have replacement vacuum pods....for 300 dollars apiece. And, of course, they are discount exempt. I looked at many different sites to see if someone else had the headlight pods at a cheaper price but could not find them. I know ebay has used vacuum pods at half the price but I don't want to replace a 50 year old part with another 50 year old part. So my question is: Does anyone know if the headlight vacuum pods sold at Year One, can they be found on another site at a cheaper price? Thanks

Last edited by moparjo68; 01/04/23 07:32 PM.
Re: 68 charger vacuum squealing [Re: moparjo68] #3108588
01/04/23 08:34 PM
01/04/23 08:34 PM
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So Near, Yet So Far
topside Offline
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Repairable ?

Re: 68 charger vacuum squealing [Re: topside] #3108590
01/04/23 08:41 PM
01/04/23 08:41 PM
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moparjo68 Offline OP
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Originally Posted by topside
Repairable ?
Good question. Does anyone know if or how the 68 charger headlight actuator vacuum pods can be rebuilt?

Re: 68 charger vacuum squealing [Re: moparjo68] #3108651
01/04/23 10:31 PM
01/04/23 10:31 PM
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that would depend on where the leak is. I would remove the pod apply a vacuum and see if you can audibly locate the leak. If not, apply 1-3 PSI of air and submerge the pod in water. let us know what you find beer

Re: 68 charger vacuum squealing [Re: TJP] #3108945
01/05/23 01:46 PM
01/05/23 01:46 PM
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north of coder
moparx Offline
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Originally Posted by TJP
that would depend on where the leak is. I would remove the pod apply a vacuum and see if you can audibly locate the leak. If not, apply 1-3 PSI of air and submerge the pod in water. let us know what you find beer



i second the above, but pictures of the leak would help in determining how the leak could be fixed if possible.
beer

Re: 68 charger vacuum squealing [Re: moparx] #3108948
01/05/23 01:52 PM
01/05/23 01:52 PM
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Pattison Texas
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Also if the leak is around where the small shaft goes into the diaphragm, I put a small zip tie around mine & it fixed the leak


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