How to Change the Coolant in an Elantra

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The coolant in your Hyundai Elantra protects the engine components from overheating damage. Over time, coolant can degrade and may actually contain debris that can damage your radiator and your engine. You should monitor the condition of your coolant regularly and replace it at least once every two years. There is no need to call a service center to change your car's coolant. You can easily drain and replace it at home. Use a blend of coolant and water when you refill your Elantra's radiator.

Things You'll Need

  • Jack
  • Jack stands
  • Drain pan
  • Phillips screwdriver
  • Water
  • Antifreeze
  • Raise the hood of your Elantra and remove the cap from the radiator. Set the cap in a secure location to replace later.

  • Raise the car with a jack and position a set of jack stands beneath the frame rails to secure it. Remove the jack once the car is stable.

  • Position a large drain pan beneath the radiator drain plug. The Hyundai Elantra radiator has a drain located on the bottom of the radiator on the passenger side.

  • Use a large Phillips screwdriver to loosen and remove the drain plug on the radiator. Allow the coolant to drain completely. Replace the drain plug and tighten it with the screwdriver.

  • Add plain, clear water to the radiator until it is nearly full. Remove the radiator drain plug and let the water drain and flush any debris from the radiator.

  • Replace the radiator drain plug and tighten it with the screwdriver. Raise the car with the jack so you can remove the jack stands. Lower the car to the ground.

  • Add a 50/50 mixture of antifreeze and water to the radiator until it is full. Start the engine and let it reach normal temperature without replacing the radiator cap. As the coolant level drops, add enough to top off the radiator. This purges air from the cooling system. Shut the engine off when the coolant level seems stable.

  • Allow the engine to cool completely. Add more coolant if necessary to fill the radiator. Replace the radiator cap and tighten it completely. Close the hood of your car.

References

  • "Haynes Repair Manual, 1996 to 2001 Hyundai Elantra"; Larry Warren and Mike Stubblefield; 2008
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