The heater core is accessed by removing the bottom part of the heater box, which is above the passenger foot well and is attached by several small screws. On earlier models you will need to remove the lower dash panel and glove box--not certain of procedure on the later models. You also need a special tool to disconnect the hoses from inside the engine compartment, and you will likely have to get new hose latches and O-rings from a dealer. I recommend getting an aftermarket repair manual first, or look at your library for the Ford shop manual.
The heater core will have to be replace, it is not hard to do and the Heater Core is about $35 at the auto parts store. Good Luck
This is an indication that your heater core is leaking. To stop the leaking you will have to replace the heater core or stop using your heater.
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The heater matrix, in a Peugeot 206, can be replaced by removing the heater core and the hoses. With the heater core removed you can replace it with a new heater core.
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