What would cause a 2000 mercury grand marquise to overheat
Did you fill and bleed the cooling system if the level was low from it leaking? Are the fans working?
Flush all of that stuff out of the cooling system if possible it can cause more problem that is solves, plugging up smaller ports in the engine and cooling tubes in the radiator. Replace the cracked intake, water pump and thermostat, take out the radiator and have it checked and flow tested, repair or replace as necessary, refill with water making sure the system is air free, then run to operational temperature to see if it overheats, make sure that cooling fans operate properly if equipped, if overheating is cured let it cool down and then drain cooling system and refill with proper antifreeze/water mix making sure the system is air free. if it sill overheats then there is a problem somewhere with engine internal cooling flow.
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