BritishV8 Forum

Here's my next attempt:

Had to trim the bracket a little to fit it through the radiator mounting frame.

You might want to put some heat paste on the sensor where it contacts the rad, make sure it picks up the temp.
https://www.amazon.com/ARCTIC-Compound-Performance-Heatsink-Interface/dp/B0045JCFLY

Ivor

Yeah, I did that but thanks. I need to go back and short the leads to make sure the fans activate. They should but I'm still not getting the right results. More later.

Jim

Have you checked it out with an infrared heat gun Jim?
Probably the easiest way to home in on the sweet spot.
The heat loss around the sensor might be too much as well. Might need some sort of insulation to function correctly.

Cheers
Fred

Turns out the switch was the wrong spec. I'll need to find one that turns on at about 185 and 195F. I think it's a 22 x 1.5mm thread.

Jim

You need the early VW Audi rad fan switch Jim.
Dual range, 95/84  - 102/91 degree C, on /off temps.
22 by 1.5mm thread.
Will run a 450 watt fan without a relay but I always put one in anyway.
Part # 321 459 481A

Cheers
Fred

Thanks Fred (just sent you a PM btw)
If I could get one just a little cooler than that I think i'd like it better.

Jim