– Park machine safely.
 – Allow engine to cool before servicing the cooling system.
 – Remove coolant temperature sensor. (See Remove and Install Coolant Temperature Sensor in Section 20, Group 10.)
Suspend sensor (A) in water and coolant mixture.
 – Bring water and coolant mixture to specified temperatures while measuring resistance of sensor. Use ohmmeter to check resistance across solenoid terminals.
 – If resistance does not meet specification, replace coolant temperature sensor.
 – Install sensor.
a. Replace copper washer.
b. Tighten sensor to specification.
c. Refill radiator and recovery tank with approved coolant.