Is the system full of coolant ? Is the heater control valve opening an allowing coolant to go through the heater core ? Under the hood in engine compartment , on the heater hose , a metal or plastic round canister with vacuum hose hooked to it .You can google heater control valve for 2005 ford explorer to see what it looks like . When you find it ,with engine running pull the vacuum hose off to see it the valve opens an closes ! Feel the hose after the valve , is it hot ?
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