Even not having pressure in the cooling system the next day isn't conclusive because any leak in the cooling system or a faulty cap will bleed telltale pressure.

Your car should have a coolant overflow bottle behind the right front wheel. Follow the hose from the reservoir into the fender. The wheel well liner will have to come off to inspect it. Point is, you can lose coolant and not have it drip to the ground immediately.

Sixto
MB-less