heater problem with heater control valve vacuum line

AS you know...Most Ford explores have a vacuum operated valve in the heater line to the heater. It is located on the passenger side near the back of the engine in one of the heater lines. You should be able to move valve with your hand. Once engine is up to temperature, feel both sides of heater hose before and after valve. it should be hot on both sides if water is flowing. If not move valve and see if it gets hot on both sides. If that it is the problem, just prop valve open until you can replace it. NEXT...I would also check your BLEND door , Fords are known for BLEND DOOR issues

You have air in the heating system. WITH THE ENGINE COLD... Take the coolant resvoir cap off. Turn the engine on. Let it get hot by touching the upper radiator hose. If its hot the thermostat is open. Grab a shop rag and carefully squeeze the upper raidiator hose until you dont here bubbles or gulps coming from the coolant resevoir. This will bleed the air out. Every so often get in and rev the engine to get the water pump to circulate the coolant and air throughout the system while your doing that turn the heat on and place your hand by vent to feel the hear. When you grab the upper hose bubbles should come from the resvoir. Remember once the resivor cap is off its vented to the atmosphere so its not going to overheat or hurt you but DO NOT TAKE THE CAP OFF THE RADIATOR JUST THE RESIVOR.

I agree the cooling system may need to be bled from air,

thank you.

will give it a try.

I don’t have an answer but a question. My heater didn’t work. Made clicking sound. Now my check engine light came on & heater now works. What’s going on.