XXXXXXX, These are quick disconnect fittings. Yeah, I know, not quick to disconnect when they have been on a long time. There is a tool to use, but, it doesn't usually work too well.
NOTE: A slight twisting motion while pulling on the heater water hose may be necessary to assist in the removal.
Pull the heater water hose away from the heater core tube.
Discard the retainer.
You can purchase these connectors from your local Ford dealer. They should have them in stock. I would depress the 2 tabs and remove the hose, then remove the remaining plastic washers and o rings.
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XXXXXXX, The 2 white clips with the tabs on it, in the above photo with the arrows, depress them both at the same time while twisting and pulling straight out on the hose. You may want to spray some nut buster to help loosen the coupling and stuck o rings.
Hope this answers your question. Please accept this answer and give feedback. Thanks, Dennis
Ford Technician
Ford Senior Master Technician,Ford Diesel Technician,ASE Master Technician,34 Years Ford Experience