I recently purchased a used 2002 GTX 3 seater. I connected the flushing hose and she ran fine but it started beeping and indicated stated engine overheating. The water seemed to be circulating fine - the rear sprout was working fine. Water was shooting out. I tried to put it in the water this weekend end. The engine started and she ran for a minute and quickly overheated - long beeping noise. I also noticed there was no water coming out of the rear sprout. Does anyone have any ideas?