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You first make sure that the cooling system is completely bled/purged of any trapped air, that can cause both symptoms, it that is done and you are sure you have purged all the air out then the head gasket would be most likely leaking.
With the vehicle up to operating temperature feel of the heater hoses going to the front heater core. if only one hose is hot then you either have a plugged up heater core or an air bubble trapped in it not letting water circulate. You might try loosening the top hose and try to burp the air out of it. Of might have to remove the hoses and try to blow compressed air through it backwards to free up the blockage.
Possible, with rad cap off, let vehicle idle until coolant fan comes on then shut vehicle off for 30 minute cool down. Top up rad, install cap and drive and recheck heater operation and any overheating.
Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core. Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..
you have air trapped in system. If you could hang van like a deer in a tee, you could get the air out. Go to a sho with evac/fill equipment and have them purge the air. You are about 3 qts short of full
Does the heater blow cold air from the vents or do you mean the there is no airflow from the vents? cold air from the dash vents when the heater control valve is set fully hot could be an air pocket in the cooling system. The radiator sits slightly lower than the engine causing air pockets to get trapped in the engine when you replace the coolant. you'll have to purge the cooling system to restore flow to the heater core. No airflow (blower motor inop) this could be a bad blower motor transistor. pin test the blower motor circuit.
Ck Eng light probably not related.
The heater core is clogged. A bottle of cooling system "quick flush" may be all you need ($6 AutoZone).
There is also a complete flush system, but requires that you splice into the heater hose (I installed it on my Taurus - works great!).
By the way, there is a heater core bypass hose. It is connected to the two heater core hoses near the firewall. You may want to remove the two "Tee" fittings and use a 5/8" hose splicer so that the flush passes through the heater core at full force. Put the Tee's back in place after the flush.
If you remove the tee fittings and don't flush, the heater will work, but the core may eventually start leaking.