Performing a DIY coolant flush on your Mitsubishi Outlander PHEV is an excellent way to maintain your vehicle's cooling system and prevent overheating. Regular coolant flushes help remove contaminants and old coolant, ensuring optimal engine temperature regulation and prolonging the life of your vehicle.

What You’ll Need

  • New coolant compatible with Mitsubishi Outlander PHEV
  • Drain pan
  • Funnel
  • Socket set or wrench
  • Protective gloves and eye protection
  • Distilled water (optional, for flushing)
  • Owner’s manual for specific coolant type and capacity

Step-by-Step Coolant Flush Process

  1. Ensure the engine is completely cool before starting to avoid burns.
  2. Locate the radiator drain plug or petcock valve at the bottom of the radiator.
  3. Place the drain pan underneath and open the drain plug to let the old coolant drain out fully.
  4. Close the drain plug once draining is complete.
  5. Fill the radiator with distilled water to flush out remaining deposits and run the engine briefly, then drain again.
  6. Close the drain plug and refill the radiator with the correct mix of new coolant and distilled water, following your owner's manual recommendations.
  7. Start the engine with the radiator cap off to allow air bubbles to escape, then top off the coolant as needed.
  8. Secure the radiator cap and check for leaks around the drain plug and hoses.
  9. Dispose of old coolant responsibly at a recycling center.

By following these steps, you can keep your Mitsubishi Outlander PHEV’s cooling system in top condition, improving performance and avoiding costly repairs. Regular coolant maintenance is key to a healthy vehicle, so consider performing this flush every 30,000 miles or as recommended in your owner's manual.