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Message from discussion ER5 radiator fan.
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Simon Wilson  
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 More options 9 July, 15:28
Newsgroups: uk.rec.motorcycles
From: Simon Wilson <siwil...@NODAMNSPAMN.hotmail.com>
Date: Thu, 09 Jul 2009 15:28:58 +0100
Local: Thurs 9 July 2009 15:28
Subject: Re: ER5 radiator fan.

cat wrote:
> I noticed when pootling through London traffic, stop starting a lot,
> that my thighs felt a bit warm. I haven't seen the radiator fan spinning
> once since then.

> I have checked the fuses visually, and they seem in perfect nick, but
> I'll continuity test them properly in a bit. Since I'm sitting with a
> cup of tea in the warm at the moment free to consider theory, what else
> should I be looking at sternly and fundamentally how can I test the
> operation of a thermostat operated bit, rev it till steam comes off?

> I can, plonk 12V on the motor and see if it spins. I can continuity test
> the wiring any place I find a metal bit to pop a multimeter on.

> Is there anything I can do with the thermocouple screwed into the rad.?
> unscrewing it would get me wet feet I suspect.

> Ta.

You should be able to check all of the wiring in one hit by just
unplugging the connectors from the thermocouple and joining them together.

Make sure you have plenty of water - on some designs low water means the
fan never comes on.

Failing that then you need to test the thermostat, either by revving the
bike until it gets hot enough (but keep an eye on the gauge), or by
removing the switch and testing it in boiling water.

--
/Simon


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