Help with heater vacuum lines

[Grumpyhead123]

The labels I placed on the lines on my 1991 Suburban heather vacuum lines came off and I need help IDing the proper location. 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

 

[SpeedlabDan]

I'd be interested in knowing as well as I'll have to redo mine from a vermin attack

 

[Grumpyhead123]

I'd be interested in knowing as well as I'll have to redo mine from a vermin attack

Hopefully the smart people will start chiming in soon.

 

[SpeedlabDan]

Hopefully the smart people will start chiming in soon.

I'll take a look at mine and see what colors are chewed off the diaphragm after work

 

[Grumpyhead123]

Where are all you super smart folks?

 

[frankin5]

The black goes to #1 and the black and brown goes to @2.

 

[Grumpyhead123]

The black goes to #1 and the black and brown goes to @2.

John,
Thanks for the reply. I don't believe the solid black line will reach #2. Based on length the black line attaches to the diaphragm with the single port. The blue/black and brown/black are pretty close to the same length so it appears they both attach to the diaphragm with the two ports.
David

 

[frankin5]

Black and blue to 1, black and brown to 2