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My gl1100 has a very minor coolant leak coming from somewhere under the bike, but I can' track it down. Is there somewhere that they are prone to leakage that I should start with?
 

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Yep, there is a small weep hole on the lower left side of the bike right on the front. The water pump is right inside a cover there. I think some people have rebuilt theirs, I changed mine. If you need help on that, you might do a search on here to find applicable threads. I found this:
http://www.classicwingclub.org/gallery/finn/index.htm
for the 1000, the 1100 is almost the same.
 

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2 more common area of leaks on the GL1100 are the coolant crossover pipes and the coolant overflow tube.

The crossover pipes lead from the top of the heads to the center portion of the engine towards the thermostat housing.
 

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phannosh wrote:
how to test water pump on gl1200
I'm not familiar with gl1200s, I have gl1000, but I believe thatboth waterpumps workwith similar princip. First there should be a weep hole on the bottom of the water pump's body. If it is clean and no coolant comes out from there, neither when the engine runs or not, then the water pump seals (one main seal and two o-rings on gl1000) are probably good. However, if you have a noticable leaking from the weep hole then the sealsare worn, as probably are the bearings, so the only solution is either to change or try to repair the pump. The other way is to remove the pump's outer cover (impeller's cover) and try to move the impeller left-right/up-down. It shouldn't move at all, if it does than the bad bearings, which ussualy goes together with bad main seal. Good luck, Alex.
 
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