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Home > Help Needed / General Tech Chat > Fan Switch, UNF thread

dazibee

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TRURO, CORNWALL

24th Sep, 2010 at 09:38:19pm

Can anybody suggest where I can buy a Fan switch with a 5/8 UNF thread. I have already tapped my thermostat housing but I can only find switches with metric threads.
Thanks
Daz

Sprocket

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Preston On The Brook

24th Sep, 2010 at 10:53:40pm

I think you need to find a new thermostat housing.

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

Rod S

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Rural Suffolk

25th Sep, 2010 at 01:46:53am

5/8" UNF is the original temperature sender size. On lots of 70/80s cars.

Get a scrap (dead) one, drill out the middle and tap it metric so it just becomes a sleeve.

Schrödinger's cat - so which one am I ???

dazibee

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TRURO, CORNWALL

25th Sep, 2010 at 07:31:24am




On 25th Sep, 2010 Rod S said:
5/8" UNF is the original temperature sender size. On lots of 70/80s cars.

Get a scrap (dead) one, drill out the middle and tap it metric so it just becomes a sleeve.


From what I've seen so far the modern metric ones are bigger. 16mm and 22mm seem popular. I can perhaps drill my housing out and retap it.


Rod S

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25th Sep, 2010 at 01:36:01pm

M12 (fine) and M14 (fine) seem common sizes especially for injection temperature senders.

Mine was M12 X 1.5 so I sleeved down using an old temperature sender (the casing is brass so easy to work with).

If yours is bigger, obviously redrill and tap but M16 will give you a problem - it's too close to 5/8"UNF to redrill......

EDIT - just realised you are talking about fan switches, not temperature senders......*frown*

Doesn't your radiator, whatever it is, have the threaded sensor point ???

They are usually on the headers, sometimes on the outlet side of the radiator, not the inlet (thermostat housing) side.

Edited by Rod S on 25th Sep, 2010.

Schrödinger's cat - so which one am I ???

dazibee

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TRURO, CORNWALL

25th Sep, 2010 at 01:55:15pm

No my rad is the Minispares 2 core without a place for the sensor. I was using a Kenlowe fan controller but that broke and let me overheat.
So I got a temp sensor, fitted it to my thermostat housing with intentions of connecting it to my Megajolt which would then switch the fan via a relay. But I discovered my Megajolt is a version 3 so auxillary inputs are not supported. Doh.
So I think I need a new thermostat housing and a 22mm switch
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