07 KGT Fan Problems - K-Bikes.com - Excellence in Motion
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post #1 of 7 (permalink) Old Jun 25th, 2018, 10:53 am Thread Starter
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Location: New York, NY, USA
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07 KGT Fan Problems

MY GT has developed an overheating problem in traffic on hot days (+85). I don't hear the fan come on so I'm assuming that it's an electrical issue.
I've been all over the parts microfische and don't see a fan switch in the system.
During normal operation the gauge runs in the normal range.
Any suggestions?

07 K1200GT

'07 K1200GT

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post #2 of 7 (permalink) Old Jun 25th, 2018, 5:16 pm
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Location: , TX, USA
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There is no separate thermostatic switch for the fan, it is controlled by the ZFE module and activated by a CANbus command in response to coolant temperature. If you have a GS911 you can command the fan on and see if it responds, or if you have no test equipment you could let the bike idle on the centerstand and check voltage at the fan connector. When the coolant gauge gets above the halfway mark you should see power to the fan. If power is there but no fan then you'll need to troubleshoot the fan motor. Other possibility is a bad ZFE module but that's pretty unlikely.
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post #3 of 7 (permalink) Old Jun 26th, 2018, 1:05 pm Thread Starter
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I couldn't find a schematic anywhere, so I'll try that.


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post #4 of 7 (permalink) Old Jun 26th, 2018, 2:27 pm
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If you need a fan, there is a used one on Beemer Boneyard - LINK

2009 K1300 GT
1984 Kawasaki ZX750-E1 Turbo
1990 Kawasaki ZX600R
2005 R1200 RT - gone
2008 Honda CBR1000 RR - gone

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post #5 of 7 (permalink) Old Jun 29th, 2018, 7:35 pm
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Had this problem before, took it to the dealer and was told the fan connector came off/loose, check that first

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2007 BMW K1200GT Love my Big Mexican Woman but very high maintenance.
2004 Yamaha FJR 1300 RIP one Fast Jap Riceburner too deadly crash and total.
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post #6 of 7 (permalink) Old Jun 30th, 2018, 1:51 am
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On top of the other suggestions, if it's starting to boil before the fan comes on:
- check the coolant antifreeze mix. 50/50 mix is supposed to raise the boil point to abt 106 degC even without the added pressurisation from the cap. If you're down on antifreeze in the coolant mix then you might be getting boiling before the design expects, possibly before the fan is set to trip-in too.
- same for the cap or other pressure leaks... the extra pressure raises the boil point as well

Sorry if I'm teaching anyone how to suck eggs here - but I've been caught out here by prematurely assuming electrical faults :P
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post #7 of 7 (permalink) Old Jul 1st, 2018, 6:06 pm
Join Date: Aug 2014
Location: Sydney, NSW, Australia
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Hi Gary,

This happened to my GT a couple of years ago. It turned out at there was a wire which was rubbing on the frame and was shorting out the fan. This could possibly be an easy fix for you.
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