I drained the existing coolant from the radiator (measures 6.4 liters). After closing the drain, I place new 50//50 replacement coolant into the reservoir (measures 4.3 liters). Then I drove the car for 10 minutes. The temp gage reads 90 degrees C. I opened the hood and added more fluid into the reservoir (it took only 0.5 liters).
Am I doing something wrong? Out 6.4 liters vs. in 4.8 liters. Is this possible?

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pat201