[67ChevyRedneck]

The next step is to run the 3/8" heater hoses through the cab. I cut mine long so that I had enough room to move around stuff.

There are no grommets on the firewall cover for these. To make them easier to slide through the firewall cover easier I put some petrolium jelly on the ends of the hoses. Leave the firewall cover off still, you still need access through it, just slide the hoses through for now.

A trick to get the hoses to go onto the underdash unit easier is to use a wrench end that is a little larger than the 3/8" heater hose line to stretch it a little. I could not get my lines to slide on without doing this.