It will pull the kids on the tube all day, even pulls the skiers and wake-boarders fine. But when I try to get across the lake in a hurry it heats up and activates the overheat buzzer and ...the only way to cool it down is to stop, put it in neutral and high idle for 30 seconds. The temperature will then drop. It will not drop as long as I am moving. I had the dealer install a new thermostat and it has not repaired the problem. It is still under warranty, but cannot seem to get a good mechanic at the shop. Anyone have any bright ideas?