1974 Models & 1975-76 280Z

Place switch in water below 77°F (25°C) on 1974 models, below 122°F (50°C) on 280Z. Connect ohmmeter to switch leads. Ohmmeter reading should be close to zero. Raise water temperature to 88-106°F (31-41°C) on 1974 models, to 134-145°F (57-63°C) on 280Z. Ohmmeter reading should be infinity. If not, replace coolant temperature switch.