how to replace the heaters hoses? on 1994 Nissan Pickup (D21)

one the heater hoses is easy to replace but the second one I do not even see where it's connected to the engine block, is there a way to replace that one?? I hve rised the truck with ramps..I have used a flash light to try to see where that hose is connected to but I just cannot see please!

Asked by for the 1994 Nissan Pickup (D21)
Follow the hose from the firewall to wherever they lead. You may have to remove something just to replace them. Book time to replace them is 1.4 hours so you may need 3+ hours to get them both. Good luck.