CBR 600 Fan wont come on

[whitedevil]

Afternoon,

Right so my rad fan isnt coming on. If i unplug the thermo switch and connect the wire to earth the fan comes on.

So this would suggest the thermo switch isnt working right? Well ive tried 3 switches, the original, one from a friend who said it was from his working bike, and one i bought from dave silvers new last week. And its still not working.

Anyone got any other ideas?
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[P.addy]

How hot is the bike getting?

[haroman666]

Test your thermostat and also check your coolant level.
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The mistresses: 2000 Honda CBR600f, 2000 Honda VTR1000

[whitedevil]

This has been going on for over a year btw.

Coolant has been changed and is full

I had a new thermostat fitted but the old one is still working fine.

The bike stays around 75c while im riding but soon gets up to 100c while im in town <30mph. And will get to 120c and shut off if im stuck in heavy traffic etc.

The thermo switch should close around 98-102c
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[Walloper]

[andym]

Have you tried wiring the fan direct to the battery to make sure that's working? If so then work back from there making sure all connections are secure etc.

Just what I would do if I had that problem... but I have no clue about these things

[whitedevil]

@Walloper,

The 2nd switch i tried i tested as you described and it was working fine, but when that didnt work i still bought a new switch from dave silvers which cost £65 so not cheap but its still not working.

@andy,

If i bypass the switch the fan comes on and works fine, so the only thing i think it can be is either all the switches are not working or maybe the rad isnt grounded properly?
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[P.addy]

Quick fix if you don't have time to check, connect fan to switch on handle bars. This way you can turn it on.

[whitedevil]

[Nb]

Single wire switch? Surely you have an earth problem, run a wire next to the switch straight to the negtive terminal on the battery and see what happens.
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Cbr1100xx blackbird gone, mk4 golf gt tdi chav now
Colin1 wrote 'Im grateful for what i can get, which isnt all that much.'
Columbus travel insurance are crap!! Do not use!

[Ariel Badger]

Earth problem X2.
Follow the circuit through with your meter.
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Bikers make great organ donors, get 115 on your licence today.

[trisers]

If the rad is earthed correctly (easy to check with your multimeter) then the only other option is the stat simply isn't being heated enough in which case you may have a partial blockage in the rad...

In which case get it off, partially fill it then tip it around a lot then drain. Then flush in both directions with a garden hose before refitting and refilling.

[Fizzer Thou]

Do you have a workshop manual with a useable wiring diagram?If so,trace the wiring circuit for the fan.Does part of the wiring that goes to the dash display go via a large multi-pin connector under one of the body panels.If so,check for any corrosion within that connector.

On the fan circuits for my old Exup there is a separate fan switch that cuts in at the required temperature.But this is integrated into a differant switching circuit via a relay on my R1,which is also fused.If you have the manual,see if yours is switched by similar circuitry.
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Just talk bikes.What else is there?

Always have a 'Plan B'

[whitedevil]

The rad has been off and checked/ flushed when i had my new exhaust system fitted last month. Its definitely getting hot by the switch.

I'll attach the wiring diagrams etc so you can see (hopefully as its a pic from the haynes with my phone) If you open them in a separate window you can zoom in on them and see a lot better

https://i.imgur.com/Xh9S3FW.jpg




https://i.imgur.com/5c9OGKH.jpg


if i disconnect the fan switch connector and touch it to the earth wire coming from the fuse box it starts up


im thinking its probably a break in this cable?
https://i.imgur.com/AAzIskP.jpg

Ill go check it when it stops raining.

Im useless with electrics as you can probably tell
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[Fizzer Thou]

From that wiring diagram it does look as though fuse #5 is for the fan switching.

And as you have found the fan switch itself on the picture page I would be placing a direct wire across the terminals of the switch and checking if the fan operates.
____________________
Just talk bikes.What else is there?

Always have a 'Plan B'

[whitedevil]

Sorted it.

It was a bad earth connection, on the pic above with the red circle, that earth wire wasn't grounding the rad properly.
All i had to do was undo the screw and put the wire the other side of the fan bracket and its working fine now.

Thanks for all the replies
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[Walloper]