Remove the cap from the surge tank. Set the heater control temp to max (A/C in any mode EXCEPT max). Start the engine and idle until lower radiator to pump hose is hot. Allow the engine to cool to ambient, and then check/fill the surge tank and replace cap.
SOURCE: Warm air from dash vents but cool air from defrost
The system just needs to get all the air pockets out if you switched everything like you said look around where the radiator hose meets where you put the thermostat in, there should be something on the lines of a little nipple with a 8 mm bolt on it i will have to pull up the exact setup of your Taurus but its the same general concept your car is fine you just have a big air pocket , what else you can do is while its cold right now and the car isnt running is to go take the radiator cap off the radiator and see if the antifreeze is low now that the car has cold down since you last ran it. If so feel it up top it off in the radiator and it might hurp it self and remove the air pocket all on its own... If you need any more help feel free im always on here id be glad to help more in detail once you try that and look under the hood for the bleeder ( the thing with the nipple on it) Also if you could please rate me i would greatly appreciate it.
Thanks,
Steve
SOURCE: cadillac deville 1997 keeps overheating already
DID YOU TRY TURNING ON THE HEATER CONTROL TO PURGE THE AIR FROM THE HEATER CORE.
SOURCE: how do I get air out of cooling system 96cadillac deville after bypass heater coil
It should eventually rise to the top of the radiator overflow tank.
Look at the tank frequently to make sure the cooling fluid is at the right level.
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