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Old Apr 21, 2014 | 05:17 PM
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I did a heater core replacement and a small black tube came from under the dash and I don't know where it go. Any one knows?
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Old Apr 21, 2014 | 07:56 PM
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Ummm, what year Vette???
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Old Apr 21, 2014 | 08:56 PM
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Default Need help

94 Lt-1 6 speed.
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Old Apr 22, 2014 | 03:27 AM
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Sounds like the vacuum source for the HVAC system.

Depending on whether you have the C60 manual system or the C68 digital system it either goes to the HVAC control head (C60) or the HVAC programmer (C68).
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Old Apr 22, 2014 | 06:46 AM
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Thanks Clif, I have the C68 system Digital. Could this make the AC switch to the dash defrost vent automatically in me not have any control over it from the AC control unit?
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Old Apr 22, 2014 | 06:48 AM
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Originally Posted by Estevenson
I did a heater core replacement and a small black tube came from under the dash and I don't know where it go. Any one knows?
Post a snapshot of the part. I'd doubt it part of the vacuum connections and more than likely a portion of the air distribution system but certainly could be most anything. If it's a molded plastic part and part of the distribution system it could likely have a part number molded into it. Post that also if there is one. Dimensions might help if you've problems posting a snapshot.

Vacuum tubing is very small maybe 1/8 - 3/16

Last edited by WVZR-1; Apr 22, 2014 at 06:52 AM.
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Old Apr 22, 2014 | 06:58 AM
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Originally Posted by WVZR-1
Post a snapshot of the part. I'd doubt it part of the vacuum connections and more than likely a portion of the air distribution system but certainly could be most anything. If it's a molded plastic part and part of the distribution system it could likely have a part number molded into it. Post that also if there is one. Dimensions might help if you've problems posting a snapshot.

Vacuum tubing is very small maybe 1/8 - 3/16
Ok i will do that when I get off from work, and figure out how to add a photo to the post..

Last edited by Estevenson; Apr 22, 2014 at 06:18 PM.
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Old Apr 23, 2014 | 01:29 AM
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Originally Posted by Estevenson
Thanks Clif, I have the C68 system Digital. Could this make the AC switch to the dash defrost vent automatically in me not have any control over it from the AC control unit?
Yes. The HVAC programmer above your right foot controls all the doors in the HVAC duct work with vacuum. If you have no vacuum you have no control.

Yours won't look like this because mine has a heater water control valve (the white tube), but the black tube is the supply for the system. It comes from the vacuum check valve mounted on the engine. There should be something vaguely similar to this that joins the vacuum supply line to the line that goes to the HVAC programmer. All of the HVAC programmer control lines are color coded. The black line is the supply.

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Old Apr 23, 2014 | 06:43 AM
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Originally Posted by Cliff Harris
Yes. The HVAC programmer above your right foot controls all the doors in the HVAC duct work with vacuum. If you have no vacuum you have no control.

Yours won't look like this because mine has a heater water control valve (the white tube), but the black tube is the supply for the system. It comes from the vacuum check valve mounted on the engine. There should be something vaguely similar to this that joins the vacuum supply line to the line that goes to the HVAC programmer. All of the HVAC programmer control lines are color coded. The black line is the supply.

Thanks for the Pic! Yes you or right what I have is different. I tried putting a pic of my from my smart phone ( i phone) can't figure out how to do it. I'll have try from my computer.
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Old Apr 23, 2014 | 05:03 PM
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Name:  vette AC part.jpg
Views: 79
Size:  35.6 KB[QUOTE=Estevenson;1586726441]Thanks for the Pic! Yes you or right what I have is different. I tried putting a pic of my from my smart phone ( i phone) can't figure out how to do it. I'll have try from my computer.[/QUOT
Ok this is the tube i cant figure out where it goes. anyone know?

Last edited by Estevenson; Apr 23, 2014 at 05:07 PM.
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Old Apr 23, 2014 | 05:12 PM
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Originally Posted by Estevenson
I did a heater core replacement and a small black tube came from under the dash and I don't know where it go. Any one knows?
Check out this thread I posted 12 years ago....
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Old Apr 23, 2014 | 05:22 PM
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Originally Posted by cohocarl
I'd say they're similar eh?

OP - It should have a part number on it so that it can be determined which location etc. I asked for that information earlier if there was one and I doubted that it was a vacuum line.
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Old Apr 23, 2014 | 05:35 PM
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Originally Posted by WVZR-1
I'd say they're similar eh?

OP - It should have a part number on it so that it can be determined which location etc. I asked for that information earlier if there was one and I doubted that it was a vacuum line.
Ok thanks!!
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