My son disconnected the heater hoses from the heater core on his 20000 Xterra 3.3L went out of town for a few days and now does not remember which hose goes to which connection on the heater core all he has is a Haynes manual and it does not show or describe the connection. There appears to be a long hose and a shorter hose could someone be so helpful and tell me does the shorter hose connect to the upper or the lower connection of the heater core. Thanks in advance for your help I appreciate it.