Is it normal for the coolant level in the reservoir tank to drop below minimum after doing a radiator flush? Just took my car in for 60k yesterday and when i checked today, the coolant was almost empty inside the reservoir tank

 

did you had coolant flushed or drain/refill coolant done?

 

the service tech drained, flushed with water, refill, rev to 3k, refill, and then bled.