I am working on a friends ’06 660 he bought as a project for me… I’ve done lots to get it going but it’s over heating. There was no coolant reservoir, no thermostat and the fan runs all the time. I replaced the reservoir, installed a new waterpump and installed a thermostat. I couldn’t figure out where the hose for the bottom of tank is. The small hose coming off of the water pump squirts coolant, but this is hooked to a ‘T’ with the differential vents. So i drained the coolant filled difs, cleaned and relubed. Now is this the line? Also, where should I start for overheating? I have cleaned the radiator.