X-Challenge - where has my coolant gone...?

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ClimbingTurtle

Bachelor Dog
Joined
May 6, 2011
Messages
10,245
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Location
Gauteng, South Africa
Bike
BMW (all models)
Took Blitsie for his inaugural test ride yesterday morning, but after a wash, i checked fluids and found 190ml of coolant missing from the rad!!

Motor has been completely rebuilt, including all gaskets and seals
New water-pump & seals and drive gears
New Radiator cap, thermostat & seal
Fresh coolant & a 50:50 mix - it was boiling with a weaker mixture - takes 1100ml exactly.
Radiator pressure tested and it holds 1-bar perfectly.

Fan comes on when it gets too hot, warning light works, but its never got that hot, fan switches off after cooling a bit.
Coolant overflow bottle volume raises a little when it gets hot, but not past the max, drops again to the starting point when it cools down.

Now what now?
Who has a thought on what I can try?
 
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