I have 1995 Ford crown Victoria LX that is overheating. I just finished replacing intake manifold, thermostat, water pump, oil filter adapter, vacuum lines and two sensors on the intake manifold. I havent driven the car yet but when i turned it over to add antifreeze to it and it started to overheat. can someone please help

Are you sure the thermostat is not upside down?

Ran into this problem many times brand new out of the box not working so just take back to store and explain what happens and they will be glad to give you another new one. Quite sure you are not going to be the first to bring back a new part that does not work.

you can check a thermostat put in boiling water and see if it opens...always check a new one first ...saves time having to change it.