My 2000 Lincoln LS V8 is overheating. I've replaced the thermostat and the fan is working properly. Water pump is fine too. Any other causes that I am missing?

Light on means codes are stored. There are well over 800 possible codes so guessing is a waste of time. Overheating could be caused by a radiator fan issue. But keep driving it like that and you'll soon be looking a a MAJOR repair for blown head gaskets. Overheating is #1 cause of gasket problems.

SOUNDS TO ME LIKE YOUR HEAD GASKET HAS FAILED

Overheating Due to corrosion block in Water Pump on Erratic engine coolant temperature or intermittent overheating can be caused by corrosion inside the water pump. ...Either condition reduces coolant circulation resulting in engine overheating.

1st, test the water pump and make sure with the belt off, that it turns freely now that you've installed it. Sometimes the impeller is not pressed on completely, and these don't turn properly.

Maybe you did this but just in case:

Always free spin anything installed , IE: water pump, oil pumps, alternator, generators, camshafts, crankshafts, etc., before moving to the next step.

2nd. Verify the belt installation. With today's serpentine belts, a wrong turn may cause the pump to run backwards, but seem correct. There should be a specific diagram under the hood or on the fender.

3rd. If the Belt's OK, Pump's OK, and you have properly installed the new Thermostat. (I have seen them installed upside down and they won't work that way.) If you filled it properly, making sure it was 100% full, then you may be dealing with a blown head gasket, cracked head, or a cracked cylinder wall.

I hope this helps & good luck!

Make sure your cooling fan kicks on.
Otherwise, it sounds like a possible leak...maybe a weeping water pump or a leak in the heater core.

Hope this helps...

Some cars have 2 water temperature sensors with one operating the cooling fan and the other operating dash indicators.

Since your A/C stopped working it sounds like the power may be off in a relay. Want to say go to reputable mechanic so you do not fry your engine.

You also do not want to be taken for an A/C recharge you may not need. Cooling fan should work whether A/C is off or on.

Some fans have 2 speeds so it is possible to need a replacement if only 1 speed works. You need someone to know the power routing. For instance, is the relay getting a signal from the temperature sensor? If the power is going to the relay, does it go to the fan? Is the fan bad on 1 speed or both speeds? This is independent of whether the A/C has a full charge.

Be careful of the spinning cooling fan blades if the fan turns on without warning.

I have put my lincoln ls in shop 5 times almost once year for over heating.. first 3 times they replaced the fan motor and fan.. worked for few months and went out again in 2 years have had 3 fan motors. Finally over heated again and they said it was radiator.. so for 800.00 they put in new radiator and as wife was driving car home it overheated.. OMG how insane and they would not refund.. so they took car back in and said it was the water pump.. guess what the so called water pump is really a Hydraulic pump.. so they changed it, fan motor, and new radiator..
Now have all this new and one year exactly car is over heating again.... Solution Get rid of the LS or all us complain to lincoln and for this car is a LEMON....

fords are notorius for recalls on headgaskets if its boiling over i would have them checked
and be sure cooling fans are working first

poss causes are thermostat stuck closed, replace it, next would be engine electric cooling fan inoperative, test it for proper operation.

I just bought a 2000 Lincoln ls V8 3.9L, i've had it for couple of days.I took a drive in it the other day, and noticed the car was overheating. Replaced thermostat, and water pump. Car is still overheating, I need some help?