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Engine Coolant Protection Inspection

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the coolant temperature and specific gravity using a thermometer and a hydrometer.
    CAUTION:
    • Use engine coolant at a concentration that meets the environmental conditions in which the vehicle is driven, otherwise engine damage could occur.
    • The engine has aluminum parts and must be protected by an ethylene-glycol-based coolant to prevent corrosion and freezing.
    • Do not use coolants containing Alcohol, Methanol, Borate or Silicate. These coolants could damage the cooling system.
    • Use only soft (demineralized) water in the coolant mixture. Water that contains minerals will cut down on the coolant's effectiveness.
    • Engine coolant damages paint. If engine coolant does get on a painted surface, rinse it off quickly.
    NOTE:
    • If the "FL22" mark is shown on or near the cooling system cap, use FL22 type engine coolant.
    • FL22 type engine coolant is shipped as a diluted solution (55% coolant, 45% water). Use the solution as is when replacing coolant.
  2. Fig 1: Identifying Proper Cooling System Cap
    G04315877Courtesy of MAZDA MOTORS CORP.
  3. Determine the coolant protection level by referring to the graph shown in Fig 2.
    • If the coolant protection level is not correct, add water or coolant.
    Fig 2: Coolant Protection Level Graph
    G04317865Courtesy of MAZDA MOTORS CORP.