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Originally Posted by 85chedeng300D
Its as simple as fluid and temparature exchange, everytime the thermostat opens, hot fluid from engine goes to the radiator and cooled water from the radiator goes to the engine. While thermostat is closed, radiator is cooling the fluid, and the engine is heating the fluid while the fluid is cooling the engine. Then when the temperature gets too hot, the thermostat will open and the fluid and temparature exchange cycle occurs.
I know the German "over-engineered" these cars but I think it's just how simple it is. It is not rocket science and it doesn't take a genius to "over-think" and "over-analyze" how these cooling system works.
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Actually, it's not that simple. You've described the flow for a typical Detroit cooling system.
On the M/B, the thermostat performs two functions.
1) It allows coolant from the radiator to return to the engine.
2) It blocks off the bypass so that hot coolant cannot return to the engine and must go to the upper radiator hose.
If you remove the thermostat, IMHO, there can be more flow from the radiator back to the engine because you don't have the restriction from the thermostat.
However, there is
nothing forcing the hot coolant to head into the upper radiator hose and some of the coolant will return to the engine through the bypass.
It's the contention of Pete and Roy that this return flow is of sufficient quantity to compromise the cooling of the engine, despite the increased past the point where the thermostat had previously lived.
I'm skeptical of this theorem, although Roy has demonstrated that it did cause an overheat on the SD.