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I am thinking that pulling those plugs might get you an SSN from an isolation fault. If moist air gets into the battery, you will most likely get an isolation fault. Then you would be in the same situation as if you didn't pull the plugs and there was a coolant leak. The HV batteries are sealed intentionally. You might want to consider running a vinyl tube from one drain hole to the other, this way, the system is still sealed, but you could see coolant in the tube.