You won’t see water exiting anywhere,especially not from the muffler.The A35 was the first Johnson to use the pressure siphon system.When running motors with this system it is important to get them up to speed pretty quickly to get the water flowing and then you can throttle back if you want.The usual culprit for over heating is rust flakes in cylinder cooling passages forming a clog at the elbows or tee fittings.
