So gang, the cleaners came just as I was planning on sitting at the laptop, so i had to leave the house and socially distanced myself in the garage
Fixed fuel sender so that the float is now pointing left instead of right!
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Filled up with and eye watering £80 of essso 99 went for drive.
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With the fuel sender showing F now, I gave the car a bloody good thrash and then sat in a lay-by idling for 10 mins. Normal driving, temps at 1/4 across, idling in lay-by, doggedly stuck to half or very slightly below (which is 85c I believe). Then I turned the engine off for a couple of mins and let it heat soak, started up again and gauge was just past half way. In under a minute, it came back down to half! Ambient temp today is 17c here. Would be interesting to see if it does the same at 25c.
The good news is, when I got home, it was back down to 1/4 and I could stop the fan with my fingers without having them chopped off!! So the Aisin is definitely working per spec!!! Yay!!!! Thanks to the gents who recommended it, it’s the first time in my Z ownership with a fan clutch that works as it should! It does however idle with a little more vigour than my other one, so there is noticeably more airflow through the rad.
Now the electric fans have become less of a priority and more of an insurance policy! I feel we should change the topic of this thread to make it more useful for anyone else for someone searching for a fan clutch in the future. Maybe it should be “electric fans and the mechanical fan clutch” or something!