Man, you are a hard headed soul.
You claim to have had a 'low coolant' level signal for months now. So maybe, just maybe, you ran the coolant out of the reservoir to the point where you pulled 'air' into the system. Go see a Lincoln mechanic and maybe he will tell you out of the goodness of his heart how to 'burb' the system correctly, although, I will admit, many of them do not even know how to.
For the last time, disconnect the cap (use a 1/4 drive with no socket attached) that is located just behind the alternator (on top of it in the back). That is where the coolant goes. NOT the overflow bucket. Run the engine and fill until the reservoir shows full. Stop filling. Put the cap back on the overflow bucket. Go back to filling the crossover tube located on top of the alternator until it is full full. Put the cap on and go drive around. Let the system cool down and take off the cap and do it again.
If this doesn't work, you have a bad radiator, bad fan, or your burning coolant which means you probably have a head gasket leak.