It sounds like you need to drain some coolant from your coolant reservoir. Check the coolant level as stated in the instructions of the owners manual. If your coolant level is higher than the max mark, use a sucker or something along those lines to bring the coolant level to the max mark.
Or are you sure you don't have another leak coming from the area of the coolant reservoir?
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Ford Diesel and Heavy Line Technician at your service. 
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