Finally getting the chance to work on this over the weekend - was out of town - and have been continuing to read up on possibilities. It seems on a number of cars the coolant temperature send unit can go bad, with the symptoms being typical of the exact problem I'm having - coolant values jumping all over the place. However, I'm looking through Nissan parts/online retailers and can't find one for the 370z. Does anyone know if the send unit is built into the sensor unit (as is the case on some cars)? That would explain why I can't find the replacement part, if it happens to be the case on our cars.
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