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post #1 of 16 Old May 20th, 2009, 11:31 pm Thread Starter
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Question Cooling Fans

My cooling fans started kicking in at 1/4 temp, where it used to be at 3/4 temp.
Any ides why it started doing this? How to fix?
Thanks,
Phil

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post #2 of 16 Old May 21st, 2009, 7:29 am
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Re: Cooling Fans

Either the fan temperature switch is too sensitive, or the temperature gage is reading low. If you have an independent way to measure the temperature of the coolant, see what the actual temp is when the fans start.

OK, I've done the easy part... Others will offer better advice, I suspect.

Good luck.
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post #3 of 16 Old May 21st, 2009, 7:29 am
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Re: Cooling Fans

not sure about what drives the gauge, and I'm pretty sure a thermal switch activtes the fans. the fans are coming on, so it sounds like the switch is working, so it could be an indicator problem

just to make sure, what's your coolant level like?

might be a pressure leak, thermostat or even a water pump failure if the temp switches are in a different part of the coolant system from the indicator sensor. I wish I had more time to look into this, but I gotta get going to work.

'00 K1200 LTC
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post #4 of 16 Old May 21st, 2009, 9:35 am
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Re: Cooling Fans

for this, I wish I had a wiring diagram instead of a repair manual.

I found four (?) temp sensors, one of which is the Air, so that's out. there is a cyl head temp, water pump temp and coolant temp.

I could swag that the cyl head temp is for the idiot light (?). so that leaves a 50/50 (~) choice for the fans and gauge.

I'll keep looking, if anyone can point me in the right direction for a wiring diagram, that would be great

'00 K1200 LTC
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post #5 of 16 Old May 21st, 2009, 10:18 am Thread Starter
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Re: Cooling Fans

Thanks for the feedback. I was wondering if it hurts for the fans to run for a long time? Where they ment to run continueously, or will they be damaged.
I would like to go for a ride this Memorial w/e but if I am going to burn up the motors?
Hope to get to the bottom of this by Saturday (5/23/09) before the dealer closes for the w/e.
Phil

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post #6 of 16 Old May 21st, 2009, 11:10 am
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Re: Cooling Fans

If you pull the side panel and look at the wiring for one of the fans it should either be a switched hot lead ar a switched ground for the fans. If it's a switched ground you will show a hot lead whenever the ignition is on and you will show zero conductivity to ground unless the cycle is hot enough to run the fans. With a switched hot lead you will have conductivity to ground and lack of voltage unless the fans have kicked on. You could also warm it up until the fans kick on and then disconnect the sensor wires one at a time to find the right one. Generally speaking the ground wires will be brown in color. Good luck.


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post #7 of 16 Old May 21st, 2009, 12:13 pm
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Re: Cooling Fans

Check coolant level and it also could be the cap has gone bad.

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post #8 of 16 Old May 22nd, 2009, 3:42 pm
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Re: Cooling Fans

The fan relay is provided a ground from the Motronic to activate the fans. It is anyone's guess which sensor actually FEEDS the trip point to the Motronic.

John
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post #9 of 16 Old May 22nd, 2009, 6:27 pm
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Re: Cooling Fans

The Motronic gets it's temp input from the sensor located on the aft end of the head. The gauge gets it's input from the sensor on the water pump.

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post #10 of 16 Old Jul 1st, 2009, 3:13 pm
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Re: Cooling Fans

How many fans has the 2005 and up LT got, one or two ?. Only one is shown in the parts sites. Only one 7,5 amp fuse as well.
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post #11 of 16 Old Jul 1st, 2009, 5:17 pm
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Re: Cooling Fans

Quote:
Originally Posted by simoncharles
How many fans has the 2005 and up LT got, one or two ?. Only one is shown in the parts sites. Only one 7,5 amp fuse as well.
2 fans on all years LT, one on each side, or one per radiator since there is a radiator on each side.

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post #12 of 16 Old Jul 1st, 2009, 5:33 pm
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Re: Cooling Fans

Could an obstruction cause this? I was sitting on the ground in front of my LT one day and noticed a plastic bag had blown up onto 1 of the radiators, completing blocking it. I didn't notice the fans running sooner or longer than usual, but it couldn't have helped to have that.

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post #13 of 16 Old Jul 2nd, 2009, 12:43 am
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Re: Cooling Fans

Thanks Zippy. Why do some posts claim that each fan has itīs own individual electrical circuit with itīs own fuse when my 2005, only, as far as I can see, has one ?.
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post #14 of 16 Old Jul 2nd, 2009, 2:51 am
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Re: Cooling Fans

Quote:
Originally Posted by Phil_Blackstone
My cooling fans started kicking in at 1/4 temp, where it used to be at 3/4 temp.
Any ides why it started doing this? How to fix?
Thanks,
Phil
Is the front of the rads blocked up with bugs and crap , if the air aint getting through it,s gonna run hotter . Regards numbnuts in blighty.
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post #15 of 16 Old Jul 2nd, 2009, 1:39 pm
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Re: Cooling Fans

Quote:
Originally Posted by simoncharles
Thanks Zippy. Why do some posts claim that each fan has itīs own individual electrical circuit with itīs own fuse when my 2005, only, as far as I can see, has one ?.
The bikes prior to 05 did have two fuses and two circuits but only one relay. The fuses were after the relay. On the 05 and up the fuse is before the relay and the fan ciruits tie together after the relay.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #16 of 16 Old Jul 2nd, 2009, 4:17 pm
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Re: Cooling Fans

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