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Radiator Fan Switch
Posted: Mon Aug 20, 2018 7:46 pm
by prelude_h22
Hi Guys,
Just wondering if anyone has any experience in rad fan switches.
I think mine is knackered on the s2000 and the fans are constantly on, even when the engine is cold and on pre-ignition.
Was going to order a genuine Honda one but they are like £65 ish.
Aftermarket is around £15
https://www.ebay.co.uk/itm/Radiator-Fan ... 1438.l2649
Has anyone tried a Mismimoto fan switch?
Whats the benefit of the switch kicking in the fan 15 deg lower than stock?
https://h-tune.co.uk/mishimoto-fan-temp ... -80-honda/
Thanks guys
Posted: Tue Aug 21, 2018 12:09 pm
by wurlycorner
For a road car - absolutely none.
You could even end up fighting the thermostat with that much of a rad fan temp drop.
Posted: Tue Aug 21, 2018 2:28 pm
by prelude_h22
Thanks Wurly,
Didnt think it would have much benefit - suppose if your on track it may help.
Will probably go genuine OEM for peace of mind.
Posted: Tue Aug 21, 2018 5:20 pm
by wurlycorner
Just looked at the ebay item you linked.
Cambiare stuff is fine - it's European, not Chinese cheap copy stuff. I'd go for that if I were you.
Posted: Tue Aug 21, 2018 8:27 pm
by prelude_h22
Thanks Wurly, I think your right.
The cambiare one seems like the one to go for, at that price I can get a spare. lol.
Posted: Tue Aug 21, 2018 8:35 pm
by NafemanNathan
If the signal wire has somehow managed to earth itself this would also explain the symptoms you're experiencing.
Posted: Tue Aug 21, 2018 8:37 pm
by prelude_h22
If the signal wire has somehow managed to earth itself this would also explain the symptoms you're experiencing.
The switch is a two wire type, would one be a signal?
Or would this be for three wire switch type?
If it were signal issue should I get a MIL light?
Posted: Tue Aug 21, 2018 8:51 pm
by NafemanNathan
A lude has a two wire type. Green and black. Green is the signal wire. The way you install a manual fan switch is to splice into the green signal wire, run it to a new switch and connect the other pole to an earth.
So basically earthing the signal wire turns the fans on.
Posted: Tue Aug 21, 2018 9:03 pm
by prelude_h22
Ahh that is interesting.
The s2k is also a green and black two wire type.
So running it to another switch the way you describe I assume would be the fan relay?
So could be a bad relay?
Posted: Wed Aug 22, 2018 6:59 pm
by NafemanNathan
I haven't delved too far down the line, but it wouldn't be a relay causing it I'd have thought. It'll either be the switch causing it to earth (as it should) or the signal wire earthing. A relay if there is one couldn't really cause it to earth the signal wire.