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Has anyone changed an impeller on a 2019 Malibu Wakesetter 24MXZ with the Monson 550 supercharged? I honestly cannot seem to locate the tensioner pulley. This engine has two serpentine belts. Any help would be greatly appreciated!

Hey guys! I have a quick question regarding the cooling system on my '94 echelon. il give you the back story first... So last weekend I bought my first boat, took it for a test drive and everything ran beautifully. I took it home, buffed the hall and tidied up some electrical over that week. The following weekend I took it out for my first time as a new boat owner. She was running a little rough (I realize now I wasn't giving the boat enough throttle/ fuel) Anyways took it for a quick loop to warm it up (about 1-2 minutes) and a alarm started going off, turns out the impeller went and no water was circulating through the system. Temps got to about 230+ before I released. (again new boat owner so this was all new to me). I shut the motor off to let the motor cool down and slowly limped the boat back in in short intervals to let it cool down. When I got back to the house I took most of the cooling system apart (hoses) and found what I think is 98% of the grenaded impeller packed in on the cooled side of the heat exchanger. Well I'm at it i'm going to change out the thermostat as a maintenance routine so I know when it was last done (this is where one of my questions comes in below). So thats the back story of all this. here's the question! - First do you guys thing I should be worried about anything running the motor that hot? (please say no so I can sleep at night) - I changed to the thermostat well replacing the impeller and noticed under the T-stat was bone dry, Should I dump a bucket of water down there to "prime" the system before testing the system? Any other tips/ tricks you might has i'm all ears! Thanks so much for the help!