SERVICE AND MAINTENANCE

Cooling System Notes

~1min read

NOTE:

When the vehicle stops after several miles/kilometers of operation, you may see steam coming from the front of the engine compartment. This is usually caused by moisture from rain, snow, or high humidity accumulating on the radiator and evaporating when the thermostat opens, allowing hot engine coolant (antifreeze) to flow into the radiator.

If inspection of the engine compartment shows no signs of radiator or hose leakage, the vehicle can be driven safely. The steam will soon dissipate.

  • Do not overfill the coolant recovery reservoir.
  • Check the freezing point of the coolant in the radiator and in the coolant recovery reservoir. If engine coolant must be added, the contents of the coolant recovery reservoir must also be protected against freezing.
  • If frequent engine coolant additions are required, the cooling system must be pressure tested for leaks.
  • Maintain engine coolant concentration of at least 50% OAT coolant (in accordance with MS.90032) and distilled water for proper corrosion protection of your engine, which contains aluminum components.
  • Make sure the coolant recovery reservoir overflow hoses are not kinked or blocked.
  • Keep the front of the radiator clean. If your vehicle is equipped with air conditioning, keep the front of the condenser clean.
  • Do not change the thermostat for summer or winter operation. If replacement is ever necessary, install ONLY a thermostat of the correct type. Other designs may result in poor engine cooling efficiency, poor fuel economy, and increased emissions.

Test yourself

A quick Jeep Wrangler quiz: every answer comes with an explanation and a link to the manual page.