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Engine Coolant Protection Inspection

  1. Measure the coolant temperature and specific gravity with a thermometer and a hydrometer.
    CAUTION:
    • The engine has aluminum parts that can be damaged by alcohol or methanol antifreeze. Do not use alcohol or methanol in the cooling system. Use only ethylene-glycol-based coolant.
    • Use only soft (demineralized) water in the coolant mixture. Water that contains minerals will reduce the coolant's effectiveness.
  2. Determine the coolant protection by referring to the graph shown.
    • If the coolant protection is not proper, add water or coolant.
    Fig 1: Coolant Protection Graph
    G01197165Courtesy of MAZDA MOTORS CORP.
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