how to flush coolant without heater hose? Can I use the waterpump bypass?

[pwrunt3pte]

i want to flush my coolant. I don't have a heater core installed in the truck. the prestone kit wants you to put a tee fitting in the heater hose and hookup a garden hose to it. I don't have any heater hoses. I do have the waterpump bypass hooked up. its a small 90 degree hose that goes from the front of the intake manifold to the top of the waterpump. i was thinking of taking the bypass hose off and adding a longer piece of heater hose and hooking it backup and putting the tee fitting in there. I believe that would allow me to pump out the old coolant. any suggestions? Has anyone tried it like this? thanks