what triggers the e-fan to turn on? you might just have a big pocket of air trapped in there and since the weathers been cold, if your e-fans are kicking on too early, it wont let the coolant temperature to get hot enough to open the thermostat, keeping that pocket of air trapped inside your system. you need to make sure the thermostat opens to properly bleed the system. happens a lot with the clutch fan cause the shits always on, and it makes it hard to work with on cold weather days.
__________________
|