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if i understand your question, no such wire exists. the thermostat is not electronic. it opens and closes when the temperature causes the spring to expand or contract. what seems to be worrying you may be no more than a coolant temperature sensor that has gone bad. if your car hasn't overheated in 30 minutes at idle, your thermostat is fine. hope this helps you.

The wire that you are probably talking about goes from the temperature gauge to the temperature sending unit which is on the passenger side between the fuel injectors etc. If your gauge isn't working and it is the needle type you can pull the connector off of the sensor (make sure you get the right wire, it's a single) and have someone turn the ignition on as you hold the connector to ground, the needle should move all the way up...if not the gauge or wiring is bad. ...........

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โˆ™ 2011-09-13 12:29:21
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Q: On 87 300zx where is the wire that connects the thermostat to temperature gage Hope a loose wire and not thermostat no reading on thermostat gage after running for 30 minutes?
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