1999 Ford Taurus, no heat. Air comes thru all vents but blows cold air like the ac is on. Replaced thermostat twice, flushed heater core three times (just did it), still ice cold air. Both pipes going into the heater matrix are cold. Also my fan keeps cutting on and off, even when the motor is not even hot, just on and off the entire time driving it.Help?

Ford you say


check that there is flow coming out your heater hoses
step 1 remove 1c heater hose
step 2 have a friend start car remember it is easy to install a heater flush valve and it makes the job easier
if there is flow then eithor you have a blockage or an air lock
if there is no flow there might be a valve in the heater lines to stop the flow of coolant to the car when ac is on i have seen theise in a few cars but they are rare if there is a valve than make sure it isnt frozen with rust and ir does work in a ford i would assume that it is a vacume valve

good luck and happy hunting