If it's the thin plastic vacuum line to the hot water (interior heater matrix) valve, I'd just cut the kink out and use some vacuum pipe to connect the two pieces back together for a repair, rather than re feed a complete new pipe through the car to the mode switch
Admin-bloke, "The D Whisperer" Pie n Pint Northerner.... Vin #4068 - y'official "Mighty Auto" test car for Admin-bloke tuning.