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check to be sure you don't have air trapped in the system. If engine temp is normal, then heater water valve may not be working (if it has one) or temp control on heater control head is not working for blend door.
If trapped air, have a shop with evac/fill equipment, flush & fill system to purge air.
The heater flow can be checked by feeling the hoses at the inlet and
outlet to the heater core. If the heater has a control valve and it is
open, both hoses should be warm. This indicates that coolant is flowing
through the heater core. If the outlet hose is cold, there must be an
obstruction in the heater core or control valve. You can go to autozone.com and register for free for free online repair manual for your Ford
Check the heater control valve and see if it's operating properly. This should be on or close to the firewall behind the engine. There will be coolant hoses attached to it. There should be an arm or lever on the valve which is attached to a cable coming from inside the car. Moving the heater temperature control inside the car should cause this arm to move, thereby allowing hot coolant to enter the heater core. If this arm doesn't move freely, you don't get heat.