I own a 2000 expedition Heat Core Has been Replaced Heat in Front and rear worked great! Had Intake Manifold Replaced if you block off rear heater hose lines great front heat if you block front heater hose lines great rear heat but with no blocking of lines rear heater works well luke warm air out of the front! I am thinking an air pocket in the system does any bobdy know a way to bleeded system or any other thoughts
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Re: 2000 expedition heat problem
First of all I would make sure the car has proper amount of coolant and you are right it is very possible you have an air pocket in the system also ask your self did you change the thermastat after you did the heater core when the car is cold make sure there is coolant at the cold mark on the reservior bottle because you might not have enough coolant then start the car and get it up to temp and if the coolant goes not go up to the hot mark when the car gets to temp you do not have enought coolant just keep adding coolant and you will see the bubble after the thermastat opens
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if blend door works blower working check make sure you have enough coolant because suvs holds right much antifreeze.heater not working heater core plugged make sure both heater core hoses hot to touch if so problem could be temperature mode switch.
With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps
Your vehicle only has one set of connections to the heating system, and you disconnected them when you bypassed the heater core. There is not a seperate heater core for the rear heat, just ducts off of the front heat.
Check the connection at the left rear of the intake manifold. The thermostat is located in the front right, the connection to your heater core is in the left rear. The fitting is a pipe that is pressure fitted into the intake manifold. You should be able to check for a leak with a flashlght and an extended mirror. Look for a silver pipe about 1/2" in diameter. The leak will increase as you increase the RPMs.
there is no heater control valve in this truck, heat control is done through what are called blend doors. So the issue may be the front blend door motor has failed, this is very common on all Ford heatimng systems except the Focus.