Strange 950ADV coolant issue - need help please...

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by alongat, Oct 27, 2012.

  1. alongat

    alongat Long timer

    Joined:
    Jan 20, 2010
    Oddometer:
    1,692
    Location:
    Toronto, Canada
    Hello everyone. I have recently bought a 2004 950ADV from my friend. Bike has 49,000km on it. One time when he and I did a ride when the bike was still his, after about 2 hours of highway, we got off the highway for a break and the 950ADV puked out some coolant out of the reservoir. It wasn't much, just a good size puddle and the overflow just stopped - we assumed it had been overfilled. We continued to ride for the next two days with no issues. I bought the bike and have ridden it a lot in different scenarios with no issues. Last week after a few hours on the highway, again, we stopped for a break and the bike puked out coolant (bright and green). The coolant reservoir indicated coolant in it toward the lower end of the range but it ran fine and did not run hot. I ignored it and we kept on for the rest of the day. On my way home, I hit some city traffic and toward the end of my city ride (about 20 minutes of stop and go (mostly stop), the bike ended up running hot enough to show all bars of temperature and flash a red light at me. No coolant on the ground this time. I finally got the bike home and noticed that the coolant reservoir was nearly empty. I am stumped - is there a coolant blockage somewhere? Is the coolant system somehow developing air pockets on these highway rides - enough to overflow the coolant reservoir and then run low when I need the coolant? The fan works - I can hear it kick in at the correct temperature range, the bike runs fine otherwise. Coolant pump failing? Blockages of some sort? I am not seeing any white smoke out of the exhaust so I assume I don't have any blown head gaskets or damaged water passages, etc...

    Any ideas or previous experience similar to this? Please share - I really appreciate it.

    Thanks in advance,
    #1
  2. kingrj

    kingrj Been here awhile

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    557
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    Mine did the same and I replaced the radiator cap which was defective and it solved the problem...The system needs to be pressurized..
    #2
  3. Deuce

    Deuce Crazy Canuck

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    Rad cap for sure. Mine did the same thing. They get gummed up, rubber hardens and looses seal. :1drink
    #3
  4. alongat

    alongat Long timer

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    Thanks guys - I don't think this leak is coming from the radiator area, I thought it is coming from the overflow tank hose but for the price of the rad cap, it sounds like it would make sense to start there.

    Thanks again
    #4
  5. Deuce

    Deuce Crazy Canuck

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    There is an overflow hose from your rad cap mount that goes into the overflow tank. When the rad cap fails to seal or your engine overheats the pressurized water flows through the hose into your overflow tank. That is why you don't see any seepage from the rad cap.

    :1drink
    #5
  6. alongat

    alongat Long timer

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    Ah, perfect - makes sense. Thanks again guys
    #6