cbruck
Member
- Jul 5, 2016
- 40
- Boat Info
- 2010 SR Sundancer 390 I/O's with 496 MAGs and Axius Drive
- Engines
- 496 MAG's
I'm having a problem with overheating and the engines going into "safe mode". It only happens over time when running pretty well full rpms. The temp gauges read 175 when it drops to guardian mode. I live 100 miles from any mercruiser dealer that can work on my boat. I replaced the water pumps just last year. I just had the boat out and the raw water seems to be fully flushing. I am going to replace the thermostats and try to drain the old (don't know how old) coolant and replace. There seem to be multiple temp sensors. Does anybody know how many sensors and at what temps they are set for? I assume that the sensors in the exhaust manifolds are set much higher than the coolant sensors. Also, does anyone know the "shop" manual for merc 496's (2010 model) that will show how to replace the thermostat and how to drain the coolant. I have the service manual #30.