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Hi everyone, I hope someone can help me. I have a 93 mazda 626 LX. And I have to replace the temperature sensor. I replace the 1st one that is the engine coolant temperature sensor And I know that the 2nd one is the temperature sending unit. I just don't know what the 3rd one is. It has a green harness. Does anyone know what it is/called? I went to the auto parts store and they said it was like the first one, so I bought it and put it on and it made my car shake real bad and it wanted to turn off, so I took it back. Can it be a temperature sensor switch?