Hello Jeff -
Thank you for your detail instructions how to check coolant level. I bought a BMW label coolant gallon from dealer in case i need to top it up but i didn't see anything inside the expansion tank! I will follow your instructions later.

Today i already purchased water pump, thermostat, 2 belts, tensioner and d eflection pulley upper/lower hoses. Will put my hand to work on this job when i have a free day off. 100K Miles service interval is making sense however, i would like to replace it before it breaking down; we drive this SAV on highway more than local.
I replaced waterpump, thermostat for retired E53 when it was 75K miles. and I may do the same for this E70.

About Temp. Gauge for the E70, i am learning it from "Cool Hidden Menu". It is very strange!

Thanks again Jeff!

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)