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Cooling fan temp switch

M

MEDOGROCKET

Joined Jul 2007
130 Posts | 1+
PORTLAND NSW AUSTRALIA
Hi All

The temp switch that came with my cooling fan is rated at 85 deg c cut in and 80 deg c cut out, basically the fan runs most of the time, I have read that a lot of people install a separate switch, I do not want to do this, so was wondering if any of you have sourced a higher rated temp switch to replace the standard one and at what rating would you all recommend, I was thinking maybe 95 in 90 out might do.
Thanks for any info
 
Tells us about your riding: altitude, temperature, speed, type, fast trails, tight trails, jetting etc.. Then we can give you better advise on your situation.

Dale
 
Gday DaleEO
Approx 1000 metres above sea level, temps at the moment around 20-25 deg c, riding mainly tighter single trails in bush land in 2nd to 4th gears, running 15/50 gearing on a 550, do not know the jetting sizers but was set up by a local dyno legend so I am sure it is right.
The bike is not overheating as such it is just constantly in the range of the temp switch, once I get out on the open trails or transports the thermo cuts out after a short amount of time, I just think the temp switch settings are a bit low.
Thanks for any info
 
MEDOGROCKET said:
Hi All

The temp switch that came with my cooling fan is rated at 85 deg c cut in and 80 deg c cut out, basically the fan runs most of the time, I have read that a lot of people install a separate switch, I do not want to do this, so was wondering if any of you have sourced a higher rated temp switch to replace the standard one and at what rating would you all recommend, I was thinking maybe 95 in 90 out might do.
Thanks for any info
Click to expand...

Not sure if they are the same thread size/pitch as the KTM switches, but I know the 640 Adventure Katos and the 990s run higher temp switches than the RFS (which is the same temps as your switch)- I have the info somewhere, I'll post it up if I can find it....
 
AUSBERG said:
Not sure if they are the same thread size/pitch as the KTM switches, but I know the 640 Adventure Katos and the 990s run higher temp switches than the RFS (which is the same temps as your switch)- I have the info somewhere, I'll post it up if I can find it....
Click to expand...


The 990 comes on at 216 and goes off at 210 (do the math)...
 
PowerCell said:
AUSBERG said:
Not sure if they are the same thread size/pitch as the KTM switches, but I know the 640 Adventure Katos and the 990s run higher temp switches than the RFS (which is the same temps as your switch)- I have the info somewhere, I'll post it up if I can find it....
Click to expand...


The 990 comes on at 216 and goes off at 210 (do the math)...
Click to expand...

On 99o C/Off 102o C approx for the 990
All I can find on the 640 is " 98o C". Presume its the cut in??

Either way, both these switches appear higher temp switchpoints than the switch you have.

Or you could purchase a Jaycar adjustable temperature switch or similar. :wink:
 
RE: Re: Cooling fan temp switch

Thanks mate
I was going to take it out and go to the auto/bike shop and match it up with something, should be a standard thread.
 
RE: Re: Cooling fan temp switch

G'Day Folks,
I'm in the same boat as MEDOGROCKET. We ride together so all the conditions are the same as Tim described. I'm on a 650 though. I fitted a switch to turn the fan off when I stop as the battery goes flat if you have regular stops and regroups and use the button the start again. The temp switch can definitely be at a higher rating as the bikes aren't overheating but rather like to run in that 80 - 85 deg C zone. 85 deg C is not running hot!, so the temp switch needs to be in the zone Tim has explained to help prevent overheating rather than running in the bikes comfortable operating temp zone.
Hey Ausberg you can bring the info with you to the Force Ride !!!!! Ha ha. I haven't had time to chase another temp switch but I imagine it would be available in varying temp zones from the switch manufacturer.
Cheers. :D
Garry.
 
RE: Re: Cooling fan temp switch

Hi Fella's
My 04 KTM adventure 950 manual states, temp switch turns on at 102 deg C (216 deg F).
Same as AUSBERG"s 990.
This seems quite high but works well on the 950 - taking into conseration it has a 1.4 bar radiator cap and compensating tank.
 
RE: Re: Cooling fan temp switch

Hi Chooka,
Yep that sounds like it might be the go. The Bergs run a 1.4 cap as well so the 950 switch might be worth a look. With the correct ratio of coolant and the 1.4 bar cap 102 deg C should be ok. I shall check that out. Thanks.
Hey are you coming to the Force Ride in May ?
Cheers :D
Garry.
 
RE: Re: Cooling fan temp switch

Hi Garry.
Ive ordered the fan kit and a KLX300 handlebar light switch for fan cut-off - nice and compact push on/off switch and similar to Berg start button.
Never thought i would use a Kwaka part on a Berg (hope you Berg owners don't hold it against me!)
I may try the 950 temp switch but rather wait till next big 950 service(can be difficult bleeding the 950 cooling system properly)
Sounds like the force ride will be awesome!
Looks like work commitments will have me very busy but will see what happens.
 
RE: Re: Cooling fan temp switch

Nice touch Chooka with the handlebar switch. I have fitted a toggle switch in behind the right bark buster.
With a temp switch from a 640 or 950 fitted then maybe the cut off switch won't be required. Well that's the plan anyway.
Be careful when you fit the fan to the radiator and do the bolts up evenly and gradually, as you can distort the fan surround and jam the fan blades. Make sure you can spin the fan through 360 deg with your finger when your finished to make sure all is good.
Cheers :D
Garry.
 
MEDOGROCKET said:
Gday DaleEO
Approx 1000 metres above sea level, temps at the moment around 20-25 deg c, riding mainly tighter single trails in bush land in 2nd to 4th gears, running 15/50 gearing on a 550, do not know the jetting sizers but was set up by a local dyno legend so I am sure it is right.
The bike is not overheating as such it is just constantly in the range of the temp switch, once I get out on the open trails or transports the thermo cuts out after a short amount of time, I just think the temp switch settings are a bit low.
Thanks for any info
Click to expand...

Well looks like you've got plenty of help here MEDOG,

Something to keep in mind though, the temp switch is at the bottom of the radiator. So, that is how hot the coolant is after the radiator has done everything it can do. I don't know what the temp differential is between the coolant at the top of the radiator and the bottom but is just something to consider.

A buddy of mine who has a 525 with a fan kit has the same issue as you, however, he added a dual sport kit to this bike to make it street legal and part of that was floating the ground on the stator and going with the heavier duty reg/rectifier set up. This puts all of the stator output to the DC system, and he never has a problem with his battery going flat and his fan runs all the time as well in the tight stuff and after shut down too.

If it was me, I'd go for the DC system conversion and let the fan run to keep the temps down on the motor. This will also probably extend the life of your stock water pump seal. And keep the pressure down in your cooling system. The only thing you'll have to do with the DC conversion is tie your headlight into the DC system. This has it's advantages too, when the motor stops the headlight stays on, a real plus when riding at night and you panic brake and lock the motor.

Dale
 
DaleEO said:
MEDOGROCKET said:
This has it's advantages too, when the motor stops the headlight stays on, a real plus when riding at night and you panic brake and lock the motor.

Dale
Click to expand...
Click to expand...

.....plus the disadvantage of running the battery down when you forget to turn off the headlight.
 
Hi,

yesterday I did my first roll out this year.
In the Bavarian Forrest, with about 4 degrees Celsius.

First ride with the new radiator fan.

In my little training area and deap wet earth I ride often with 1-2 gear.
The radiator fan was sometimes on.

Effect: I can´t start with the e-starter one time! :(
 
I went to my dealer yesterday looking for a switch from the ktm 950 year 03.
Ih has 102 dg,but a larger diameter!
 
Thermo Switch

FYI:
Here some Thermo Switches with higher temps:

Behr Thermot-Tronik 8.160.11.329 (100/95°C)

the same as
Mercedes Benz PArt Nr006 545 71 24
Volvo 1 378 504
BMW 6131 3 364 273
or
Facet 7.5063 (102-97°C)

the same as used in BMW, E30, E28 (BMW Part 61 31 1 364 273)

http://www.autoteile-shopping.com/ats/d ... 88&tsn=625
or
Vernet Calorstat 2605 (100/95°C)
 
I have replaced the standard thermo switch with a Champion brand switch CFS10 95c on 90c off, cost $45.95, there are also some switches avaliable from Tridon TPS106 95c-90c & TPS108 102c-97c
So far so good, the fan still comes on to protect from over heating but far far less and the result so far is a much happier battery, I will write again if any problems occur
 
MEDOGROCKET said:
I have replaced the standard thermo switch with a Champion brand switch CFS10 95c on 90c off, cost $45.95, there are also some switches avaliable from Tridon TPS106 95c-90c & TPS108 102c-97c
So far so good, the fan still comes on to protect from over heating but far far less and the result so far is a much happier battery, I will write again if any problems occur[/quote

If the alternator is rewound with just one charge curcuit for 100% DC then running coolonig fan wont prescent a problem to flat batteries. Flat batteries would be a thing of the past as long as you run within max output.

When they upgraded to running cooling fans as standard they never upgraded the alternator bit silly don't you think.

Regards

Sparks.
Click to expand...
 
I have replaced the standard switch with a 100c-95c unit and rode a lot of tight single track at our Oz Force Ride last weekend. The result was that the fan came on once while idling and waiting for the group to gather. It only came on for a few seconds then went off. The battery is now fine. Lots of stops and restarting with the starter. No problems so far, so hopefully that will be the end of the flat batteries. 100c with a 50/50 coolant mix and running the standard 1.4bar cap, is not hot considering the coolant manufacturer's claims that this mix and cap should raise the boiling point to over 130c. All in all the bike seems happy and now the owner is happy so it has to be good hey !!!
Cheers :D
Garry
 

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