Just wonering what goes here!!

[Guest robs76]

im thinking its mabee some kind of cooling sensor,,its located on the coolant housing by the upper radiator hose

[Jersey]

I have no idea what year, make or model Z this thermostat housing is from (might want to fill in your profile or add a signiture so we know what your working with) but i'll take a stab - It may be for the Auxillary Cooling Fan. It's the hairdryer looking device on the pass side of the motor that cools the injectors and fuel inside the lines when the Z is shut off if the coolant is above a certain temperture. The sensor might be called the Thermal Transmitter? Not 100% sure because i only use the Water Temp Sensor (the one that has the wire coming off of it in your pic) for the gauge. If your working with a Z and not ZX, please disregard my entire reply

[Guest robs76]

sorry bout that:) it a 83 Z Turbo motor,,,and what you say sounds good to me,,so i can probably cap it,,,i swapped this motor in my 76 280z

[Jersey]

No sweat. Just makes it easier for everyone to answer your questions. Capping it works. GL.

[Phantom]

Thermostat housing comes with three sensors on the "standard" NA L28. A single 1-wire sensor for your instrument cluster engine temp gauge plus two 2-wire sensors. One is the "engine temperature" sensor which feeds info back to the ECU to affect duration of fuel pulse (cold = long, rich). Other is the "thermotine switch" which fires the cold start injector in the intake manifold.