Why would the fan turn on immediately after starting the car? The engine could not be hot enough to trigger the thermostat, even if it is 96 degrees outside.

Check fan relay.

Its possible that you got a faulty thermostat that is actually sticking open and not allowing the water to actually heat up to temperature. Try checking the heater and see if you actually have heat. If not, I would start there and purchase another thermostat. It's the cheapest route and I have purchased bad ones myself.

CHECK THE THERMOSTAT. THERMOSTAT IS THE ONE THAT SENSE THE ENGINE TEMPERATURE AND TURNS ON COOLING FAN WHEN THE ENGINE IS HOT.

180--------have radiator tested soon along with the waterpump

250 DEGREES ENGINE GETTING TOO HOT.SOUND LIKE CLUTCH FAN FREEWHEEL.IF CLUTCH FAN DONT LOCK IN OR HAVE RESISTANCE TURNING BY HAND WHEN ENGINE HOT.FAN CLUTCH IS BAD.IF FAN CLUTCH OKAY COOLANT LEVEL CORRECT.I WOULD CHANGE THERMOSTAT FLUSH OUT ENGINE AND RADIATOR.IF ENGINE TEMPERATURE STILL READS 250 DEGREES OVER FLOW JUG OR RESERVOIR NOT BOILING OVER THE COOLANT TEMPERATURE SENSOR FAULTY.

YOUR VECHICLE CALL FOR 195 DEGREE THERMOSTAT.THERMOSTAT SHOULD OPEN AT 188 TO 195 DEGREES.CHECK COOLANT FAN CLUTCH THE FAN SHOULD HAVE RESISTANCE WHEN TURN BY HAND WHEN HOT.IF NOT FAN FREE WHEELING ALL THE TIME THAT WOULD CAUSE ENGINE TO RUN HOT.

replace your thermostat

the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob

The normal operating temp is 192 degrees(t-stat opens)

You likely don't want to hear this but Northstar engine a common for head gasket failures. One good test that I use it to fill the coolant tank all the way to the top. Then start it up. If the coolant shoots out of the tank. The heads have a problem.