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Ls 400 Cooling Fan

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My cooling fan has decided to run all the time

It is the fliud drive (coupling ) type. Has a pump and seperate resovior etc. with a large fan driven by a hydraulic motor.

Toyota don't know the answer only say "with soleniod disconnected fan stopped. Could be solenoid, ECU, Temp switch or wiring."

Has anyone any suggestions.

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Welcome to LOC.

Thought it was a funny time to post at 3.10am then realised the time difference in Tasmania.

I have looked at the wiring diagram and the common factor seems to be the water temp switch located on the bottom of the radiator.

If you have access to a multimeter check to see if it's short after disconnecting the 2 wires to it.

Good luck,


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