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Matt king

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  1. Matt king
    I have a 1993 Mack RD 690 S AND is is giving me a code of 1-7 which is the coolant level sensor changed it and code will not go away. Any help would be greatly appreciated. I put two sensors in thinking I got a defect but same problem occur
  2. Matt king
    I have a 93 Mack model RD690S WITH a electrical malfunction light 1-7 Coolant level sensor. Changed sensor filled coolant tank and light still flashes same code is there something I'm missing?

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