Vacuum Canister Help

[mightykp]

After zf5 swap, couldn't get downpipe to slide in, but wanted to test shifting.
<10 minutes later... STUPID TAX
Melted the housing of AC/blower.
Anyone help with routing of vaccum cannister box?
Here is my incriminating evidence:

 

[IDIBRONCO]

We might need some more information. The year would help. I see that it's new enough to have a 7.3PSD in it.

 

[mightykp]

1995 F350 Dually 4-door.
I know this is the IDI section... but that's where all the best help is to be found.
Hoping I can just use an aftermarket vac canister and tie it in, after high temp duct tape on the blower box. Just don't know if there's a line going into the ac blower box near/through firewall.

 

[trancas]

Dollar Tree
Eat Peppers
Solder lid back on, solder tubing(s) into end.