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If your dashboard gauge is ok and the needle is moving when the engine start to warm up but never attempt the middle you have to check the thermostat as follow: you start the cold engine and carefully you keep your hand on the hose which transfer the cooling fluid from engine to radiator. If immediatelly after starting the engine the hot water goes through the hose, is 100% shure that thermostat is blocked open and needs to be replaced. A blocked thermostat in the position closed will cause more damaged because the engine will be overheated and the headgasket will be "burned".

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Q: Engine runs cold in 2001 Z3 roadster Is there a fuse or switch for the thermostat so you could check if its bad BMW won't tell and want to have thermostat and housing replaced?
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