Thermo Fan Temp Sensor

[skidmark]

I have the rb20det installed and running in my Datsun 240z. My next step is to wire up the thermo fan. My question is. Can one of the temp sensors on the thermostat housing be used to control the thermo fan?

Mick

[D.I.Y. Mik]

From what i have seen on my 32 gtst... no.

The big sensor is for the ecu, the small one is for the dash temp gauge.

Your fan sensor would have a different signal voltage for a given temp. You could test this with cold water, hot water, an accurate thermometer and a multimeter.

The sensor in the bottom of the radiator is something to do with aircon i think not 100% sure, its not a good location for engine temp control as its after the water is cooled by the radiator.

Its a pain to take off the manifold and either tap one of the existing holes or drill and tap a new one. So i just got one of those bits that goes inline with the top rad hose and you can put a sensor into it. They are usually 1/8 npt. Thermo control sensor may be bigger so you might have to drill and tap, you just have to decide where.

My thermo control is still not set up, i just have a good temp gauge and a switch in the cabin.

[blind_elk]

As above, you can't use either thermo sensor from the RB20. And the Z radiator doesn't have the sensor in the bottom of the radiator.

The thermo fan should come with a sensor and rheostat. The sensor normally fits in the top radiator hose where it connects to the radiator.

[skidmark]

Thanks guys that's all I need to know

Mick