it doesn't matter man,if you cant tell were they go than just hook them upit doesnt matter what way it flows through the core.
The heater inlet hose is on the firewall. On the 2002 Silverado it is close to the bottom of the firewall on the passenger side.
Remove both heater hoses from inlet & outlet of heater core. Connect these hoses together.
I don't know about the outside diameter of the hoses but, the outside diameter of the heater core inlet and outlet tubes are 3/4" (inlet) and 5/8" (outlet).
On the firewall, under the hood, you will find the inlet and outlet hoses.
Upper and lower radiator, inlet and outlet heater core, bypass,Upper and lower radiator, inlet and outlet heater core, bypass,
It depends on the vehicle you have. In many cases (but not all) the inlet hose is smaller than the outlet hose.
Couple inlet and outlet hoses together
Disconnect heater core inlet and outlet hoses - couple them together
Simple, take the inlet and outlet hoses going to and from the heater core and connect them together.
No it will not, it will just back flush the heater core and clean it out.
2 - inlet & outlet
join the inlet and outlet hoses together.