How to Change the Coolant in a 2019 Husqvarna FC350

Shop parts for a 2019 Husqvarna FC350 Dirt Bike.

Changing the coolant in your 2019 Husqvarna FC350 is essential for optimal engine cooling, preventing overheating, and maintaining peak performance on the track or trail. Follow this robust MotoSport guide to ensure a safe and thorough coolant replacement specifically for your FC350–noting unique points about the model along the way.

What You'll Need

  • New coolant formulated for dirt bikes (Engine Ice or manufacturer-recommended type)
  • Container for old coolant
  • 10 mm wrench
  • Ratchet & socket set
  • Funnel
  • Gloves & safety glasses
  • Shop towels

Step-by-Step Coolant Change Guide

  1. Let the Bike Cool Completely—Never open the cooling system when hot. This prevents injury from pressurized hot coolant.
  2. Remove the Seat and Right Side Panel—For best access to the radiator caps and plumbing, remove the seat and right side plastic using manufacturer-recommended steps. This is important for the FC350's narrow chassis and packed component layout.
  3. Position the Bike Upright—Ensure the bike is stable on a stand, making coolant draining and filling easier.
  4. Drain the Coolant
    • Locate the water pump cover on the right side of the engine. The coolant drain bolt is identified by a copper washer.
    • Place your drain container beneath the water pump. Remove the radiator cap first to relieve any system pressure.
    • Using your 10 mm wrench, loosen and remove the drain bolt. Let all coolant drain from both radiators and the pump.
  5. Flush the System (Recommended)
    • If switching coolant types or for thorough maintenance, fill the radiators with distilled water.
    • Start the engine and let it idle briefly, then shut off and drain the water as above. Repeat for extra cleanliness.
  6. Reinstall the Drain Bolt—Replace the copper washer if damaged and tighten the bolt to specification.
  7. Add New Coolant
    • Pour slowly with a funnel until coolant reaches the base of the filler neck. Do not overfill.
    • Reinstall the radiator cap securely.
  8. Burp the System
    • Heat-cycle the engine. Run until warm (ideally until radiator fan activates, if equipped).
    • Let the bike cool fully, then re-check coolant level in the radiator and overflow reservoir. Top off as needed—the FC350 uses an expansion tank, so expect to see coolant move between radiator and reservoir during heat cycles.
  9. Check for Leaks & Secure Panels—Inspect around drain bolt, water pump, and hoses for leaks. Reinstall seat and side panel.

Points Specific to the 2019 Husqvarna FC350

  • The FC350 shares its engine configuration with KTM's 350 models—drain and fill procedures are nearly identical.
  • This year features a compact radiator and pump design. Access can be tight, so move wiring and plastics aside for clear working space.
  • Use only recommended coolant; mixing types can reduce cooling efficiency, risking overheating. The FC350's high-revving motor is sensitive to overheat, particularly in race conditions.
  • Monitor the reservoir in days following coolant change—minor drops are normal as air escapes, but repeated low levels may indicate a leak or trapped air.

Pro Tips for Husqvarna Owners

  • Never substitute automotive antifreeze—always use a dirt bike-specific coolant to protect aluminum parts and maintain optimal thermal transfer for your FC350.
  • If you ride in extreme temperatures or race, consider switching to a high-performance coolant for additional boil-over protection.
  • Record the date and hours at each coolant change for your maintenance log.

By following these steps, you'll maintain your 2019 Husqvarna FC350's cooling system and keep engine performance at its best for every ride.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.