Quote:
Originally Posted by Lotus7
Based on this thread, the fact that ambient temps around here are now in the 20 to 30 deg. F. range, and that my coolant level was at the "MIN" mark, I decided to top it up.
It took 450 mL (almost 1 pint) of 50/50 BMW blue coolant/water to bring it up to the "MAX" marker. It was definitely at "MAX" this summer when temps were 70-80 deg. F. I'd guess that half of the [indicated] drop was due to normal evaporation as the system "breathes" during warm up and cool-down, and half was due to the coolant contraction due to the outdoor temperature.
Again; 35i, 7500 miles and a probable actual loss of about 225 mL (the other 225 mL will be back in the warm weather.  |
Do you know the volume of the coolant system off hand? With a change in temperature from 80F to 20F your "static" coolant level should be about 11% smaller.