Welcome to the forum.
Look on your master panel for a pump switch: That will turn the pump on and off (didn't the dealer tell you this?) Now if you're wanting to flush the system of antifreeze: Turn on the pump and listen for it you'll find it.
Typically the water pump is near the fresh water tank and/or water heater. Look for a panel you can remove (usually you'll find a couple of screws--if the panel is stapled it isn't meant to be removed).
Looking at your TR floorplan: I'd bet the water pump is either under/in the couch or under the fridge or closet.
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