This weekend I pulled my boat to the lake not remembering that I had seen a low coolant message on my dash a few days before. When I stopped at the docks to put the boat in the water I saw the message ENGINE TO HOT and realized I was sitting at about 240 or 250 temp. So I let it cool down added some water from water bottles and put the boat in the lake. Now when I went to pull the boat out of the water it ran fine but sounded like a real bad exhaust leak. I drove the boat home and had no problem with it over heating. The weird thing is once the truck heats up the horrible sounding exhaust leak goes away, its only there when I first start up the truck. By two or three miles it goes away. I was told by a friend it could be a head gasket, what do you think
The truck is a 2003 silverado with the 5.3 and 90,000 miles
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