new complete engine car is overheating

i just recentely had the enginge in my 1992 eldorado replace but it has just started overheating i had another dealer look at the enginge as well as an independent mechanic any ideas ? the motor is a 4.9 ltr 300 v8.

Welcome to AF, not much info here, what was found so far, how hot does it get, what are the symptoms?

check the temperature sensor, if it heats up and keeps going to the peg it might be that, couldnt hurt to flush the radiator