2007 K1200GT with Coolant Expansion Overflow Problem
I am new to this forum, I just bought this bike, and I have an issue, the Bike runs great, it does not over heat, like I ran the bike for about 20-25 mins in center stand, it never went over mid way on the gauge (2 bars ) . And the fan comes on and off, now the here is issue, when the fan comes on the coolant starts coming out of drain line on the expansion tank line, and as soon as the fan stops, the coolant stop coming out of expansion drain line!!! , there is what I know the previous owner recently replaced the radiator with used one ( the new cost around $1000 !!!) , this was prior to my purchase, and when I called his indy shop, trying to find out the issue I was told there is possibility radiator is wrong one for the bike or blown head gasket ! Well the part number on radiator is 7 690 643 35/2007 , I called local BMW dealership , and the radiator for K12 and K13GT are the same, so assumption of wrong radiator I don't believe is correct, and as far as blown head gasket, I did not see any oil in coolant or coolant in oil, and when bike was running there is no smokes coming from pipe, and the fact that bike ran for 25 min without overheating let me believe the head gasket should be ok. So either the used radiator is defective although there is no evidence of leaks, but it could be flow issue????? Radiator cap issue??? Thermostat problem??? water pump ??? Air trapped in system???
Like As I said the gauge stays at two bar(in middle) So not sure why I am losing coolant when the fan kicks in? So any input will be much appreciated.
Last edited by Joe Abedini; Feb 7th, 2020 at 10:34 pm.