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2003 745i temp sensor connector for thermostat is reading only 3 volts. It should read 5 volts I know. I'm getting no circulation past my thermostat .I just wanna ask if the sensor would cause my thermostat not to open before I tear it apart and get a knew one. Thanks. And is it super important to use exact type of coolant for this car waterpump gets hot fast could be issue for code?

Vehicle: 2003 bmw 745i 4.4 liter v8

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