all my coolant leaked out so we thought it was a loose hose. but when we poured water into the reservior, it is sucked into an area mid engine and begins to steam under the throttle body until there is no more in the reservoir.
leaking coolant on 2003 Ford Explorer
I would check the thermostat, there is a large black plastic housing for it. They can leak on the 4.0 V6 Fords and they go under neath the intake, near the throttle body. I have done a few.
THIS IS EXACTLY WHAT IT WAS. OUR MECHANIC SAID THE THERMOSTAT HOUSING WAS CRACKED. THANKFULLY IT WASN'T THE HEAD GASKET LIKE WE WERE THINKING!! THANKS.
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The way an automotive shop would locate the leak is by removing the radiator cap and attaching an adapter that screws on in place of the radiator cap. Something that looks like a bicycle pump with a pressure gauge attached to it is used to "pump up" pressure to simulate pressure generated when the cooling system is at operating temperature, the leak is then found sometimes it is obviously leaking from a coolant hose or cracked housing, failed gasket or water pump, sometimes the engines cooling system needs to be inspected from below or inspected using a mirror and flash light. If the coolant loss is still evasive dye can be added to the cooling system that may indicate the source of the leak. A mysterious coolant loss may even be a sign of a head gasket that is not sealing well.