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There are at least three temp sensors that I know of. The head temp sensor which you have already changed, then there is a couple of them below the upper radiator hose on the thermostat housing. One is a single wire which is for the temp gauge, and then there is a two wire right next to it. That one is called the water temp sensor, and is used primarily when the car is cold. If it doesn't switch as the coolant warms up, it'll stay in open loop. Let the car cool down completely, and with a voltage meter, measure the resistance between the two terminals. There should be resistance cold. Then warm the car up and measure the resistance. If there is still resistance, the sensor is bad.
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1982 Nissan 280ZX N/A
K&N Filter
Flowmaster Muffler
15" Turbo Wheels
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