I just finished the long over due coolant flush for my LX 450. Flushed as per directions on this site, replaced upper and lower heater hoses and by-pass hose and thermostat (thanks cruiser Dan). Filled with 50/50 mix of red Toyota and ran for some time. Everything seemed fine but after about 20 minutes of running the lower hose going to the thermostat housing never got hot. Is that normal? Which way does the water flow in the cooling system? Does this mean the radiator is working well? I will be replacing the fan clutch in the morning. Thanks to all.