There's a sensor in the overflow container.
You need to have enough coolant to turn that dash light off.
But in your case. It wouldn't hurt to fill it up because it's going to suck something into the engine from that container. It can either be coolant or air.
You don't know how much air you have in the system at all. The bigger and more loud the waterfall volume. The more air you have.
I'm betting he tells you to fill it up.
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