I have a Ford Expedition and my cooling system is leaking I cant figure out where but it is running off the firewall near the engine. Someone has told me that it could be the heater core control valve but i cant see it or i dont know where it is. I have found the heater core lines but cant see the valve. Someone Help Please
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No they do not use a heater control valve, the expedition uses whats called a blend door which is driven by whats referred to as a blend door motor,which control's the air flow though the heater core or a/c evaporator to heat or cool the passenger compartment of the vehicle.
If you smell antifreeze it may be 3 possibilities: 1. you may have a leaking hose/hose connector , or water pump. 2. your heater core is bad and needs replaced. Unless you know what you are doing I would highly suggest taking to dealer for heater core replacement. The dash and steering colum has to be removed to get to the heater core. This is not an easy job believe me (about-900-1200 job). If you have your heater core replaced then also replace the climate control door. This is good preventative maintenance and also a a dollar saver. I would have a pressure check run on your radiator as a first thought. All you may have is a bad hose and that can easily be replaced.
Could be a couple of things. Newer vehicles have a heater control valve inline with the hoses that lead to the heater core. Another thing to check would be your coolant level. If it is low air can become trapped in the line and restrict flow to the heater core. Be careful when checking your coolant level it is a pressurized system.
an expedition has a heater control valve, being from california the heat rarely got turned on so the coolant just sat in the core, expeditions are prone to plugging up heater cores anyway and this would be my guess as to what has happened. the fix would be to remove both hoses from the core and attach a garden hose to the core itself, see if the core will flow water in both directions, if it will, run water in both directions until it runs clear, if not replace the core, also make sure the control valve is not stuck and that the vacuum lines going to it are routed properly, finally.... make sure to completely bleed the cooling system so that there is no air trapped in the system, especially in the heater core
The heater flow can be checked by feeling the hoses at the inlet and
outlet to the heater core. If the heater has a control valve and it is
open, both hoses should be warm. This indicates that coolant is flowing
through the heater core. If the outlet hose is cold, there must be an
obstruction in the heater core or control valve. You can go to autozone.com and register for free for free online repair manual for your Ford
check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.
The heater core shares the same housing as the air conditioning evaporator core. The drain for the AC is designed to leak condensation. The coolant could be draining out of the same drain hole. To test a heater core you must use a cooling system pressure tester. If the pressure drops during testing search for your leak looking at all your cooling system components including your radiator. If the heater core is leaking coolant should be coming out of the AC drain hole.
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.