2000 lincoln ls overheating. Replaced the thermostat, replaced the hydroulic fan still overheating when car starts moving

Was the cooling system purged/bled of air? on this engine u must do that, here is the procedure, if it still overheats after you get the air out then u most likely have a leaking engine cylinder head gasket, this is common on this car.

The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling systeml , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank