issue with thermo fans, solved!

So my thermo fans stopped going and i noticed there where a few things that could be the issue.

firstly, I've ruled out the fan being ceased, i know its fine cause when attached to 12 volts its running fine.

second is the sensor in the radiator...?

third is the sensor in the block thats just below the carbs....?

without ripping them out putting them in boiling water and messuring resistance, is there one that fails more than the other or one that causing this issue.

question if i short the plug that goes onto the radiator switch should the fan go on?

the temperature gauge on the cluster seems to be working fine too if that makes a difference (i'd imagine it would have to get it of one of these sensors)

its just this issue and replacing the diaphragms and the bike should be good as new!

Last edited by wisc on Fri Jun 08, 2007 11:04 pm, edited 2 times in total.

The sensor in the radiator is likely the coolant temperature sender so if you're getting a reading on your dash and it doesn't look low (ie it gets up to 80+) then that's fine.

If the fan works when you short it using a wire then the problem is the thermo switch. It is located on the left side of the radiator (if 00 zx6r).

Replace it and should be ok ($35?). I've had this problem before.

mate u kno more abt it than me..so ill shut up...for a change...

so if i short the plugs that plugs onto the radiator switch should the fan turn on?

so if i short the plugs that plugs onto the radiator switch should the fan turn on?

Sure will
I have used a plastic coated paperclip and just peel back the plastic just enough to fit the connection but don't forget to disconnect it when you stop or you'll flatten the battery

so if i short the plugs that plugs onto the radiator switch should the fan turn on?

Sure will
I have used a plastic coated paperclip and just peel back the plastic just enough to fit the connection but don't forget to disconnect it when you stop or you'll flatten the battery

Jeeze im a tool, was it one of Murphy's laws, the its always the simplest thing...

blown fuse! all this time I've been riding round and watching the temp turning it off at lights so it doesn't over heat and it was just a fuse and there was even a spare fuse in there! pulled the whole bike apart to check the sensors and it ends up being a fuse! bit worried why it blew in the first place but dynoverks had it apart so probably shorted something accidentally. just replace it and got the fan running fuse didn't blow again so must be OK.

Thanks rossi, you confirming the short turns the fan on made me investigate further. I had already tried earlier to short the points but it didn't work...after you confirmed that the fan would work i thought it had to be wiring, then it hit me... fuse!

man I cant believe i didn't find it earlier.. should have been the first thing i checked. trying to over complicate the problems... ohh well at least i got to change my float valves and check my diaphragms while i had it apart!

so if i short the plugs that plugs onto the radiator switch should the fan turn on?

Sure will
I have used a plastic coated paperclip and just peel back the plastic just enough to fit the connection but don't forget to disconnect it when you stop or you'll flatten the battery

Jeeze im a tool, was it one of Murphy's laws, the its always the simplest thing...

blown fuse! all this time I've been riding round and watching the temp turning it off at lights so it doesn't over heat and it was just a fuse and there was even a spare fuse in there! pulled the whole bike apart to check the sensors and it ends up being a fuse! bit worried why it blew in the first place but dynoverks had it apart so probably shorted something accidentally. just replace it and got the fan running fuse didn't blow again so must be OK.

Thanks rossi, you confirming the short turns the fan on made me investigate further. I had already tried earlier to short the points but it didn't work...after you confirmed that the fan would work i thought it had to be wiring, then it hit me... fuse!

man I cant believe i didn't find it earlier.. should have been the first thing i checked. trying to over complicate the problems... ohh well at least i got to change my float valves and check my diaphragms while i had it apart!

Never mind mate, at least it's fixed

Reminds me of the day I had a boiler in millions of bits, changed several hundreds of dollars worth of bits only to discover the daft owd bugger had the electricity cut off for non payment

hahahaha....