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Discussion Starter #1
Hope someone in here has better knowledge than I. 2006 k1200lt with 71,000 miles. Cooling serviced less than 1000 miles ago and fluid is topped off. It seems to have an intermittent problem. Some days i'll go out and ride all day with stop and go, and no issues. other days (as in today) went out and bike overheated (no red line on the 06, just black band all the way up)and fan never came on. Stoped the bike then turned the key back on. Fan kicked on, but stopped shy of cooling the bike properly. rode it more. stopped let it idle and fan kicked on but stopped again (actually cycled on and off). The bike doesn't act like its overheating, but the bars are way up there. Can anyone give me a starting point for diy troubleshooting. Does the Water temp sensor turn on the fan. Did a lot of research but just can't find exactly what controls the fan. Don't want to spend a bunch of money at the stealer before I exhaust all my options. Any help will be greatly appreciated.
 

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Air in the system, possibly . Look for "cooling woes"


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Wrencher Extraordinaire
2005 K1200LT
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OK there are two sensors. One at the water pump that drives the gauge and one at the rear of the cylinder head that tells the ECU to turn on the fans. I suspect one of those is bad. Next time is goes all the way up on the gauge get a thermometer up against the radiators and see what the temp really is. I suspect the gauge sender is bad and shows an overheat when it isn't there.
 

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Discussion Starter #4
Thanks for the link MONDRAGE. Turned out to be a very easy fix. Cracked open the radiator cap. Burped the radiator hose a couple times and got some fluid to spit out. Took for an 80 mile stop and go and fast ride. Temp was perfect all around, and fan came on when needed. Air in the system was the culprit. How about that, an easy and cheap fix on a BMW LT lol.. Thank you.
 

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Discussion Starter #6
Tricky_dickey probably when i flushed it last month.. that's when the problem started. I didn't follow the directions properly. Should have used the screwdriver in the hose trick. I just presumed that since the fluid flowed in and filled, that it was all it took.. My mistake
 

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I just finished flushing my 05LT. I used the screwdriver trick and of course spilled coolent all over. I am having a hard time watching seeing the coolent level in the reservoir. I took a 60 mile ride yesterday am.... It's hot here in Texas. The temp was about 1/2 way on the display. I thought it ran a little cooler before the flush. What is the normal read on that display? I am thinking I need to pull up her skirt and top off again.

Thanks,

Dan
 

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I just finished flushing my 05LT. I used the screwdriver trick and of course spilled coolent all over. I am having a hard time watching seeing the coolent level in the reservoir. I took a 60 mile ride yesterday am.... It's hot here in Texas. The temp was about 1/2 way on the display. I thought it ran a little cooler before the flush. What is the normal read on that display? I am thinking I need to pull up her skirt and top off again.

Thanks,

Dan
In temps between 70 and 85 or so, mine runs almost halfway up the display (right in the middle of the little block that indicates center of range). At temps below 70 it will run lower, sometimes below the bottom of the center of scale block. At temps 90 and above it will run slightly above the center of scale block. This all assumes riding at least 55 MPH. Ride much slower or go up a long hill and the temp will rise.
 

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I just finished flushing my 05LT. I used the screwdriver trick and of course spilled coolent all over. I am having a hard time watching seeing the coolent level in the reservoir. I took a 60 mile ride yesterday am.... It's hot here in Texas. The temp was about 1/2 way on the display. I thought it ran a little cooler before the flush. What is the normal read on that display? I am thinking I need to pull up her skirt and top off again.

Thanks,

Dan
I've never had to use any significant tricks on my LT when refilling. I make sure it is on the center stand on a level surface. I then add coolant slowly so that the filler neck doesn't get blocked and gurgle. I then massage the radiator hoses a few times to burp any excess air out. I fill to the brim and install the radiator cap. Fill the overflow tank to the full mark and go for a ride to get it good and hot. Helps to let it idle at least once until the fans kick on. Then I let it cool fully and top off the reservoir if any coolant has been sucked into the radiator. Never had a problem doing this. I think the main trick is to fill the system very slowly. I don't use a funnel, but just a measuring cup with a pour spout so I can pour through the filler hole without blocking the escape of air. If you use a funnel that completely seals the filler neck and then pour suck that the funnel is always full of coolant, I can see where that might block the air coming out and cause issues.
 

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Thank you sir! I am going to go for spin this am as well. I think from your response I might be good. I hate the idea of taking that top cover off again. I saw a post where a guy added a primer bulb from a boat gas can so he could add fluid from the expansion tank. I think I will do the same next year.
 

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2005 K1200LT
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I used to burp the top hose but found that a very slow pour while filling virtually eliminates any trapped air.
 
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