Check to see if your 5.7 has 2 coolant sensors---if it does they should be on the front of the engine on the intake manifold and on the cylinder head, usually on the driver side close to the exhaust manifold.
Trouble code 21 presents two possibilities. Coolant temperature out of specified range or coolant temperature sensor out of specified range. If you are not overheating try changing the sensor. It's inexpensive and easy enough for everyday home mechanic. We own a 92 Tempo GL with the 2.3 motor.
Have the coolant changed immediately and you will be ok.
Trouble code P0118 means: Engine Coolant Temperature Circuit High Input Replace the coolant temp sensor
Chances are it wont read the coolant levels meaning your car will go bang!
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Trouble code P0118 means: Engine Coolant Temperature Circuit High Input Replace the Coolant Temp Sensor
Trouble code P1151 means: Coolant Path Clog Up for Coolant Heat Storage System
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Trouble code P0117 means:Engine coolant temperature circuit low input
Trouble code P0128 means: Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
Low engine coolant