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Help with heater vacuum lines

Grumpyhead123

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Joined
Nov 16, 2018
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Location
Austin, TX
The labels I placed on the lines on my 1991 Suburban heather vacuum lines came off and I need help figuring out where they go on the heater box. The heater box has two diaphragms, one with a single port and one with double ports.
The single port diaphragm seems simple enough because its at the far end of the box and the line is very short. My problem is where the lines go on the double and I marked them with a 1 & 2 in the first picture with the colored lines on the second picture.
Can anyone help with which lines go to which ports?
Thanks,
David

IMG_1361-2.jpeg

IMG_1360.jpeg
 
Best I can tell from a vac diagram, the blue goes closest to the heater box, and tan on the other one.
 

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