2 Foot Warrior

I'll have to describe this, sorry. Looking for a home for a vacuum line. Comes off the rear diff locking switch feed line on the right hand side under the seat where the purple vacuum line t's off just before the one way valve into the diff lock switch. It's a white vacuum line and appeared to go up into the rear seat door panel. It wasn't attached and I can't find a home for it. Everything seems to work so I plugged the extra hole and now the diff lock works again. Any ideas?

And where in the blazes is the low pressure switch for the A/C system?