47-55.1 Lincoln Cooling Fan

[dsraven]

the LS engine coolant flows through the rad and butts against the closed thermostat (until it opens) at the engine coolant intake of the water pump then, when the engine heats up, coolant flows. you wouldn't see flow in the rad until this point. the old small block way was flow through the thermostat from the engine outlet side, not the intake side.
either way, no flow through rad until thermostat opens. flow through heater hose all the time.
check out this link for an in depth look at cooling system, steam lines etc. LS specific
http://www.billavista.com/tech/Artic...ble/index.html