Engine Coolant Protection Inspection

WARNING: This page is about a different car, the 2017 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Measure the engine 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 Mazda Genuine FL22 engine coolant.
  
  Fig 1: FL22 Mark On Cooling System Cap
  Courtesy of MAZDA
- FL22 type engine coolant is shipped as a diluted solution. Use the solution as is when replacing coolant.
Determine the engine coolant protection level by referring to the graph shown in the figure.

Fig 2: Engine Coolant Protection Level Graph
Courtesy of MAZDA
- If the engine coolant protection level is not correct, add water or engine coolant.