This has been done several different ways. You can see some examples scattered throuhout the picture gallery.Thats the easy bit, run the hoses up behind the seat where the wiring harness goes. Then back down with the harness to the engine. It needs to be plumbed into the by-pass hose i believe. I have never done it, so i can't give more details....
Could you tell me which line you tied your heater into when you installed you cab heater? I would greatly appreciate any help.This has been done several different ways. You can see some examples scattered throuhout the picture gallery.
I put a heater in my 743. I put a 13000 btu between my legs, and reworked the brake pedal. The lines stayed under the cab, so I did not need to worry about tilting the rops, and tied into the bypass hose.
Others have mounted them next to your left arm, but the core needs to be narrow. Again there are some pics in the picture gallery in the "Media" section.