No heat
I have a 2002 Ford Expedition 5.4 4x4.
It will blow out heat from time to time
but not like it should. Ive flushed the
front an the rear heater core out til
clear flowing out an flushing the
radiator as well. I've changed the
thermostat twice, changed water pump
I've bought the heater cores but was
told it my not be them since I've done
all the other. I have good blowers good
water flow what else could it be?