2008 1200 GT - Overheating - BMW Luxury Touring Community
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post #1 of 6 Old Apr 29th, 2019, 12:27 pm Thread Starter
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2008 1200 GT - Overheating

I have an '08 K1200GT which is overheating as soon as it gets up to highway speed. It is early in year so days have been cool and this still happens. Fan is working, could it just need a coolant flush
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post #2 of 6 Old Apr 29th, 2019, 1:48 pm
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Re: 2008 1200 GT - Overheating

You can try a coolant flush if you have the vacuum tool, but check your thermostat also. If the fan is working while the bike is sitting in traffic, check coolant too.

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post #3 of 6 Old Apr 29th, 2019, 2:41 pm
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Re: 2008 1200 GT - Overheating

More than likely it is a very dirty radiator. If you are willing to do a coolant flush you realize you need to refill it under vacuum. So at this point is is not much more work to just remove the radiator so you can do a proper cleaning. A dental pick to remove small stones and dry bugs from between the fins, care is needed not to trash the fins. blow with air from the back as needed, You will be amazed at the amount of crud you will get out. Spray with S100 motorcycle cleaner and rinse really well this gets dirt and the rest of the bug guts out. Spray with Brake cleaner and rinse really well, all kinds of black oily junk removed. Now it is about as clean as it is going to be. You need the Oring for the water pump inlet to replace going back together as that is the removal spot for that pipe. The rest are clamps. And there are clips and screws to get the guard off and then the radiator. Watch carefully the way the plastic guide pieces go. Use a little red rubber grease or O-Ring grease on the rubber bushings the radiator fits onto.
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post #4 of 6 Old Apr 30th, 2019, 9:20 am
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Re: 2008 1200 GT - Overheating

Overheating due to a dirty radiator is a known issue on these bikes.

I've had good luck with placing a sheet of aluminum window screen (available at any hardware store) between the factory plastic guard and the radiator. It's a quick, cheap fix that effectively makes the holes much smaller, keeping the radiator cleaner while still allowing sufficient airflow. Been working fine that way on my K16 and K12/13 bikes for more than a decade now.

Makes it much easier to clean the radiator at every 18K valve check, too. You are soaking and cleaning the radiator at every valve check, right?

Ken
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post #5 of 6 Old May 1st, 2019, 1:05 pm
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Re: 2008 1200 GT - Overheating

Screens on doors/windows can block up to 50% airflow, I would think that may pose a problem on a bike as well.


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post #6 of 6 Old May 1st, 2019, 1:56 pm
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Re: 2008 1200 GT - Overheating

Not in 200,000 miles or so I've been doing this on my last 5 Beemers...

Honestly, keeping all the bugs and road gunk form getting embedded in-between the radiator fins likely makes it work better. It definitely makes cleaning the radiator at every valve check much easier.

I've tested this riding through Death Valley on a 123F day, and on a 100F day sitting in traffic with no overheating issues at all.
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'13 Dark Graphite Metallic K16GTLD, 24K miles
'09 Magnesium Beige Metallic K13GT, 63K miles
'03 Anthracite Metallic K12LTC, 66K miles
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#143, IBA# 366, MOA# 111996, SCMA# 24032


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