Coolant from overflow hose - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 21 Old 05-02-2019, 04:38 PM Thread Starter
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Coolant from overflow hose

Hi everyone. I have a big problem with the Street 750 2017. When the engine warms up (for example in traffic) the fan starts, the recovery tank fills with coolant and the bike spills refrigerant from the overflow hose under the bike. After a few trips at high temperature the tank is completely emptied. The Rome Harley workshop has already changed the radiator cap, the thermostat and the head gasket (!!) but the problem still persists. The coolant is the Harley original one. The radiator does not seem to have leaks. What can it ever be ?? They told me they had also done a pressure test and it's ok. Maybe is the cylinder cracked?
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post #2 of 21 Old 05-04-2019, 05:48 PM Thread Starter
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Is there anyone?
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post #3 of 21 Old 05-04-2019, 10:50 PM
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Have not heard of the XG having that problem before maybe get on the V-Rod forums and see if that water cooled engine has had any similar issues. I don’t know if the engines have similar design in their cooling systems, it’s worth a shot.........
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post #4 of 21 Old 05-05-2019, 03:39 AM
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This issue is not rocket science and you should not face it as such, I am very surprised that the garage was unable to rectify it and feel if the bike was in front of me then I would be able to do so - there is very often a simple reason as to why it is happening - if you consider what the water does i.e. cooling of the bike engine then it is quite easy to narrow down where a problem could be.
Water is cooled in the radiator then travels round the engine gathering up heat whilst cooling the engine at the same time - returns to the radiator to be cooled and the process continues. The fan kicks in when the water is at such a temperature that the radiator and forward motion of the bike is not sufficient to cool it.


You have not said if this is something that has just started to happen or if it has been a problem for a while i.e. since you had the bike?



Things like this need a bit of detective and dismantling work and you need to rule out one potential issue before you start checking for another.
The thing to look for here is why the engine is overheating - I am presuming it is overheating as you say the fan operates.


Overheating of a motorcycle is usually a sign that the engine is not set up properly - I presume the garage removed the plugs and checked them? also your bikes ecm needs to be inspected to ensure it is set up properly. (not something you can do yourself unless you have a fuelpak or similar) I am presuming that the oil and oil delivery has been checked?

I am also presuming that the radiator is clean and the fins are not blocked with debris?
If all the above is checked out then the only other thing that can be causing this is a blockage somewhere in the water fluid delivery either to / around the engine or to / from the radiator. An air hose or a powerful jet of water supply can be used to check this.
A good mechanic who has the time to check out the above should be able to sort out the issue.
but

Like I say - this should not be a major problem and providing everything is set up as it should be and working as it should it should not occur but clearly one of the things I have suggested seems to be amiss - sorry I can't help more. ;(
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post #5 of 21 Old 05-05-2019, 09:31 AM Thread Starter
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the problem has already occurred 3 more times since I bought the bike. Previous times they changed radiator cap, thermostat and radiator hoses. The fan is free and clean, like the radiator. They did a pressure test and there are no leaks. The oil level is right and they tell me that it runs well (in fact there are no leaks). Perhaps the hoses clamps? Is it possible that the ECM is so bad setted? The overheating light never goes on
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post #6 of 21 Old 05-05-2019, 10:59 AM
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Have never heard of the overheating light coming on - not sure what temperature would have to be achieved for it to light up. I suggested the ecm may need to be looked at because, other than friction (which I doubt is your cause because you say the engine is running correctly), the only thing that can make an engine run 'hotter' is a poorly adjusted fuel / air mixture.


What country are you in ? i.e. is the air temperature adding to your problem. If this is the case there are 'waterless coolants' available that offer better cooling properties.



Regarding the 'pressure test' I was not suggesting there were leaks as these would be evident - as you are aware coolant leaves an obvious mark where it is leaking from, I was more considering that there could be a blockage somewhere in one of the waterways in the engine etc.

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post #7 of 21 Old 05-05-2019, 11:51 AM Thread Starter
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Thanks! I hadn't thought of the ECM ... but they had to think about them, yet they never told me they had checked it! the clutch is all ok, I have no problem managing the gears. Is there any diagnostic test I can do without devices? the DIAG procedure on Odometer does not give errors...
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post #8 of 21 Old 05-05-2019, 02:14 PM
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No, sometimes when people fit after market parts such as an high volume air filter this can affect the volume of air/fuel and this can drastically affect the running temperature of the engine - this is why I suggested that the ecm can be checked if only to rule that out as a potential problem. Think about it - the only things that cause heat are combustion or friction.

I doubt there is an error code that will advise you of this and the only way to ensure your engine is running properly is to have it mapped - as I say though, this requires specialist eqpt such as an FP3 or similar. Your spark plugs should be able to give some pointers as to how the engine is running.

see: Guide : Knowing the Condition of Vehicle Engine From Spark plug | motor modif contest | trend motorcycle wallpaper extreme modify


Unless you are really racing your bike in hot temperatures the radiator and fan should be able to keep the engine in a 'normal' operating temperature. If it doesn't then the things that I have suggested need to be checked in order that they can at least be eliminated and the cause found.


If all the things I have suggested check out (and I very much doubt they will) then you could try the waterless coolant that I suggested as this does improve the running temperature of water cooled vehicles.
see: https://en.wikipedia.org/wiki/Waterless_coolant


If you do get to the bottom of this issue, which by trial and elimination I sure you will, please notify the forum what the issue was just in case it rears it's head again.
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post #9 of 21 Old 05-05-2019, 06:35 PM
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My first Street had the water pump replaced in warranty . Ride it home after it starts leaking , turn it off & get under the bike to see where it is leaking . There is a small weep hole under the water pump on the left side of the bike .
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post #10 of 21 Old 05-06-2019, 01:59 PM Thread Starter
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the coolant flows from the overflow hose, not from the waterpump. Did this happen to you too?
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