From easiest to hardest: Does radiator have enough coolant? Is the fan working? Could be a bad thermostat. Water pump (there is a small hole in the bottom of the water pump. If there is water dripping out of the "weep" hole, then the water pump is bad). Could be a blown head gasket. (Is there any water in the oil or does the coolant in the radiator have a fuel smell?
check under your resavor cap
It is either the head or head gasket, compression is getting into the water jackets causing air to go into your radiator.
According to a drawing in the 2000 Lincoln LS Owner Guide : The engine cooling fan fluid reservoir is located in the engine compartment , it is between the engine and the passenger side of the engine compartment * it takes Motorcraft MERCON automatic transmission fluid , fill to MAX line on reservoir
well if its a five speed its located on the driver side and there should be a square plug holding it. im not to sure about atomatics
First look on the engine cooling system for bleeder valves. Use them to bleed the air our. If if has none then remove the radiator cap and fill it to the very top with a 50/50 mix of antifreeze and distilled water. Turn the heater control to full hot and start the engine with the radiator cap off. Watch for escaping air bubbles and keep the radiator full at all times. Once you see no more air bubbles the air is purged.
Yes you should put fluid back in before you lower the roof, otherwise you could damage the new pump. And yes you should put the reservoir plug in before trying it or you run the risk of leaking fluid out and damaging the new pump.
remove ..wheel...now tap out clip holding the caliper....remove the caliper and brake pads....... (hang it on a bent cloths hanger.............remove the bearing cover...........remove the cotter pin.......remove bearing nut.........pull off the rotor and wheel bearing..........remove bearings from the rotor and clean very good with solvent and repack the bearings with wheel bearing grease to be ready to install in turned rotor or new rotor.....now replace rotor and tighten the nut very tight to seat the bearings then back off nut tighten the nut " hand tight plus 1/4 turn and install the cotter pin....remove the top off of the break fluid resivor and some kind of squeezing device to push the pucks back in and have plenty of cloths under the resavor in case fluid pumps over,install the pads and clips and caliper then the wheel . you may want to put some brake anti-squeel on the back of the pads before you install then.............good luck ERh