Crappy picture sorry. I tapped the hole in order to attach my vacuum gauge to the motor. By pulling a vacuum on it my hope was to suck out any coolant. There shouldn't be any coolant on this side of the motor. If the coolant had been leaking a long time some of it might have made it to the inverter side. I'm trying to avoid paying $7k for a new drive unit. Luckily there didn't appear to be any moisture in this section. I still let the vacuum pump for a few hours.