vyv_cox
Well-known member
Probably a silly question:
If I remove the thermostat will all the cooling water go through the bypass or will it circulate through the engine block?
It depends (always a great reply ) Thermostats on many raw water cooled engines have a dual function - as they open they allow hot water to leave the block and simultaneously close the bypass. This is true of Bukh and Yanmar but not of Volvo. With the first two removing the thermostat will often cause the engine to overheat as the water goes straight through the bypass uncontrolled. I suspect that the same might happen with Volvo but the function of their cooling system is a bit of a mystery, dependent upon the restrictions in the two possible routes.