[问题] coolant content

[xing]

I put coolant into the reservior without the test to make sure 50% with water a couple of weeks ago. The result is that the pointer of the temp gauge does not move at all if weather temp is below -5C. However it seems OK if you drive over 10 km at roughly OC. Did I use much more water or less?
Aprreciate any recommedations!
Thanks in advance,