I drained it.. filled it.. ran it to temp... let it cool... drained it.. filled it.. ran to temp let it cool.

What I found that was odd is that I only was able to add a little under 2 gallons to the system when all was said and done.

Does the heater loop really hold nearly a gallon of coolant?

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.