unfam... i think a lot of people would put it back to the heater connection that existed on the passenger side at front of motor (bottom radiator hose)... i did ages ago when i bypassed a heater

in the vid they have put it to top radiator hose. this is the hose flowing into the radiator, i.e. for hot water to be cooled. i'm just realising putting it to the bottom radiator hose means your sending hot water from the back of the motor back through the water pump and into the front of the motor without passing through the radiator to cool...

i guess the effects on overall cooling may be negligible with a decent cooling system, but interesting to think about none the less