Ok my 1998 glastron 4.3 with a v/p cobra sx outdrive overheated on the way back in today. My impellar on the fresh water pump looks brand new thermostat works fine and ran water through both manifold and was coming out the prop good. also backflushed the main hose that runs to the pump. Any suggestions had the lower unit rebuilt last year and did fine on the way out there but overheated on the way back. Thanks for any help
