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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).
Couple inlet and outlet hoses together
Upper and lower radiator, inlet and outlet heater core, bypass,Upper and lower radiator, inlet and outlet heater core, bypass,
The outlet from the engine that feeds hot coolant into the heater core is usually (but not always) located close to the thermostat. The return hose from the heater core usually returns into the water pump.
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.
Simply disconnect the heater hoses going to and from the heater, (Inlet & Outlet) at the firewall. Purchase the proper size hose coupling that will allow you to connect the 2 hoses together. Do not plug these hoses, just connect them together. The coolant will now not flow through the heater core.
You will see 2 heater hoses connected to the firewall. These are the inlet & outlet hoses going to the heater core. Disconnect them and then connect them together with a coupler. This will bypass the heater core.