2004 Ford Focus leaking fluid from antifreeze tank

It sounds like you have a blown head gasket, check your engine oil, take off your oil cap and if it is frothy around the cap and inside the head, you have a blown head gasket.

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have a cooling system pressure test done to see if there is a leak

Does it overheat on you ??? If not,, try replacing the radiater cap..Make sure the vehicle is cold before removing the cap..If that doesnt do it,,and the vehicle not overheating,,you may have a small combustion leak..Like a head gasket..But first try the cap..

if it is leaking it will eventually over heat, these tanks are know as expansion tanks, and will over time deteriorate and get fine cracks that open when hot, remove and inspect the tank itself should be a 1 hour job, good luck i hatge this car

I would check the heater core. You can rent a pressure tester from the auto
parts store and put a piece of cardboard under the vehicle, then pressurize
the system to the pressure on the cap. Come back in an hour or so and look
at the cardboard. (if your heater core is leaking it will come out through the
air conditioner drain on the passenger side.) This method will identify where the fluid
is coming from in terms of area on the vehicle. You may want to pressure wash the
engine a day before to make things more visible.

Also check to be sure that the
overflow tank hose is connected to the radiator, these can come off and allow
the radiator fluid to escape the vehicle instead of being transferred back and
forth between the radiator and overflow tank as mine did. I didn't even notice as it
had fallen down behind the battery.
Hope this helps.

Check to see if you have fluid in the tank. Next see if there is fluid leaking out underneath the vehicle. Can you hear the pump running? Check for a blown fuse.

Just real quick do you have air conditioning on your car and is the fluid coming out green,red,clear,etc?

your antifreeze may be low check the overflow bottle

I do not believe that there is a radiator cap on the Focus. I believe that the coolant is filled from the what most would consider the overflow tank. It is an overflow tank of sorts but serves also to fill the radiator.