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?

65Z01

Ummm, what year Vette???

Estevenson

94 Lt-1 6 speed.

Cliff Harris

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).

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?

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

Estevenson

Ok i will do that when I get off from work, and figure out how to add a photo to the post..

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.

Estevenson

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.

Estevenson

[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?

cohocarl

Check out this thread I posted 12 years ago....

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.

Estevenson

Ok thanks!!