Is there a drain valve for coolant on 600 ace et skidoo

Yes, there is a coolant drain valve on a 600 ACE ET Ski-Doo. It is typically located on the bottom of the engine block, and it can be opened to allow coolant to drain out of the system. However, the exact location of the drain valve may vary depending on the year and model of your Ski-Doo, so it is always a good idea to consult your owner's manual or a repair manual for specific instructions.