If your Fiesta has a/c it's very likely that the drain tube is blocked.The tube is a litle bit awkward to get at,it's under neath the heater box you can see it if you get on your knees and stick your head in the footwell.if you can access the spring clip that secures the drain pipe and gently pull the pipe away you shold be able to get a blowgun with a long nozzle onto the end of the rubber pipe and blow all the accumalated dirt out.One word of caution be careful not to break the outlet on the heater box or you'll be looking at a new heater box.
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