Radiator Fan Confusion

[Guest]

Ok, the radiator fan isn't coming on at all so I thought I'd better fix it as the weathers improving!

If I ground the wire going into the fan switch the fan comes on(fan Ok), I fitted a brand new thermostatic fan switch(switch Ok), but it still isn't coming on. I thought it might be the contact so scratched up both sides, but still no joy .

I also stripped and moved the earth connection from a loose radiator connection to a firmer point on the body.

Any ideas?

http://farm3.static.flickr.com/2347/2481402286_fa79e45182_m.jpg

Edited May 10, 2008 by Anonymous

[Korben]

It's probably the thingy bit that takes the temp of your engine. Normally cheap to replace.

Thermastat or something.

If you have not guessed I ain't technical!!

[Guest]

Nah, thats what I thought but I installed a brand new thermostatic switch.

[Korben]

That's me out of ideas then.

[DutchMick]

is it becoming too hot?

[cyberwolf]

have you check for any brakes in the wires connect the fan up so its running and move the wires see if it cuts out if thats not it then im with korben that's me out of ideas then

Edited May 10, 2008 by cyberwolf

[Guest]

I'm keeping an eye on it! Only gets high in town with 5 or 6 successive redlights (London is Sh*tsville) ,I pull over and let it cool just before it hits the red. A/B/Mway it's fine.

Fan stays on constantly when shorted. Checked continuity of fan->switch wire, and is fine.

I am ABSOLUTELY STUMPED!

(I can't believe I'm listening to Def Leppard 'Hysteria' again, I really am a sad old man..)

Edited May 10, 2008 by Anonymous

[Guest]

Nooo u need to sort it, or its gonna go...

http://www.hgsc.bcm.tmc.edu/downloads/graphics/Bang.jpg

[Guest]

Oooerrr, don't want that.....

[cyberwolf]

wait for one of the know it alls to come on akey or stu_m

[Stu]

whats the temp getting up to ?

are you sure the fan should actually be cutting in ? the bike could be ok and its not getting hot enough

[Stu]

wait for one of the know it alls to come on akey or stu_m

 

i will remember that when you need help

[cyberwolf]

wait for one of the know it alls to come on akey or stu_m

 

i will remember that when you need help

 

ok soz you dont know nothing about bikes is that better

[Stu]

[Guest]

No digital readout on my 1996 CBR , but it's getting to just below the red. I'm scared to push it any further!

[Stu]

ideally you need to check the temp of the coolant while its warming up if the fan doesnt cut in by 111 degs c then start worrying

have you checked the coolant ? it could be very low and under the sensor for the fan

im not too clued up on the cbr's to be honest but most older bikes are the same

[cyberwolf]

can the cooling system block up?? you could try washing the old coolant out and putting new coolant in. you thoughts on that stu as i know feek all about it

[Guest]

Coolants up to level in radiator and reservoir. Fresh in a couple of weeks ago. Thermoswitch is near base of rad as well, so I'm confident it's covered.

Edited May 10, 2008 by Anonymous

[Stu]

yes it can block up

if the coolant is old it will be sludgy and block the passage ways

i would give it a flush and put new coolant in and go from there

[Guest]

Guess I'll wing it for now. I'll get a toggle switch from Maplin and cable-tie it under the fairing! Too hot at lights? Hit the switch! How's that sound? My Bionic-bike!

[cyberwolf]

have you check the fuse?

[Guest]

Fuse is ok.

[Guest]

Nipped down to Maplins, got switch and connectors, all done! What do you think?

http://farm4.static.flickr.com/3258/2483521754_7d0cc8cb79_m.jpghttp://farm4.static.flickr.com/3240/2483521676_b1da99ebe6_m.jpg

[Guest]

well it will go on/off now but annoying prob that---must be a thermo switch wire out -- you got a new unit so must be ok that--and you flushed system of gunge--that is basically it