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Old 04-19-2021, 04:33 PM   #1
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Default 1995 Nissan D21 KA24E - What is the thread pitch for the coolant bleeder screw?

The fan clutch is stuck on my hardbody and the old plastic fan blades are cracked so I decided to take on the challenge of designing my own electric fan upgrade.

In order to control the fan I prefer to use a NPT style threaded sensor/switch to read the actual water temperature, instead of the probe that gets inserted in between the radiator fins.

I noticed there is a bleeder screw on the intake manifold, does anybody know the thread pitch of this screw? Or perhaps any better ideas where to thread a 1/8" NPT temperature sensor/switch? I will share pics of the fan shroud design once I have more details figured out. Thanks!

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Old 04-19-2021, 05:00 PM   #2
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Not sure on the thread but when I installed the water temp gauge in my former 93 I used the adapter that went in the radiator hose, it worked fine, and is designed for a mechanical gauge sender (1/2" I believe), but you could adapt it to a smaller sender.


I used one from Autometer and it fits in a 1 1/4" hose.



https://www.amazon.com/Auto-Meter-22...8851522&sr=8-2




pic below:


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Old 04-19-2021, 05:57 PM   #3
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That's not a bad idea, I think I will use that if I can't find something to thread directly into that bleeder screw hole. That would be the cleanest solution, yours looks like the second cleanest solution, just need to make sure I use a two wire switch with that one.
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Old 04-19-2021, 06:07 PM   #4
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The air bleed screw you are asking about is very small, like a 10MM equivalent bolt, you will have a hard time finding a sender that would fit into that opening.
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Old 04-19-2021, 06:53 PM   #5
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Well I have been able to find thermo switches threaded for 1/8 NPT as well as M10 and M12, although those are costlier. I also found a Derale switch with a very small (6/32?) thread. Would be great if I can adapt something to fit there. Just trying to explore all possible options first!
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Old 05-10-2021, 02:49 PM   #6
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I ended up purchasing a similar radiator hose adapter to yours:

https://www.amazon.com/dp/B018FY10PQ

I will update thread when installation is complete
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