How to Change the Coolant in a 2019 Husqvarna FC450HQ: Step-by-Step Guide

Shop parts for a 2019 Husqvarna FC450HQ Dirt Bike.

Routine coolant changes are vital to maintaining your 2019 Husqvarna FC450HQ’s performance and protecting its engine on the track and trail. This guide is crafted exclusively for MotoSport riders and focuses specifically on the FC450HQ’s design, system tips, and best practices. Read on for the complete, proprietary how-to from MotoSport.

What You Need

  • Fresh coolant (manufacturer-recommended for aluminum engines)
  • Drain pan
  • Clean rags
  • Basic metric hand tools
  • Protective gloves and eyewear

Preparation

  • Ensure the bike is cool to the touch before beginning. Pressurization and high coolant temperatures can cause severe burns upon opening the system.
  • Position the FC450HQ upright on a stand for stability and level draining.

Step 1: Access the Radiator Cap

  • Remove the seat and left shroud (if necessary) to access the radiator cap on the left side of the radiator.
  • Depress the release button and turn the cap counterclockwise to remove it. Store it in a clean, safe place.

Step 2: Drain the Old Coolant

  • Locate the coolant drain bolt at the lowest point of the water pump (right engine cover).
  • Place your drain pan beneath the area.
  • Loosen and remove the drain bolt. For quicker flow, gently loosen the radiator cap further if not already removed.
  • Note: Avoid skin and eye contact–coolant is toxic. Immediately rinse with water if contact occurs and change clothes if necessary.

Step 3: Flush the System (Recommended)

  • With the system fully drained, you may flush distilled water through the radiator filler to clear out any remaining coolant or sediment–especially important for bikes that’ve seen hard or muddy use.
  • Allow to drain completely.

Step 4: Reinstall the Drain Bolt

  • Inspect the drain bolt washer; replace if damaged.
  • Thread the bolt back in by hand, then torque to manufacturer specifications.

Step 5: Add Fresh Coolant

  • Slowly pour the recommended coolant into the radiator filler neck until it reaches the base of the neck (do not overfill).
  • Reinstall the radiator cap by pressing down and turning clockwise until secure.

Step 6: Bleed Air from the System

  • Start the engine and let it idle with the radiator cap on. This helps circulate coolant through the entire system and will purge most air pockets.
  • Let the bike warm up fully (thermostat opening temperature) – the level may drop as air purges.
  • After shutting down, let the engine cool to ambient temperature, then re-check and top up the coolant if needed.

Step 7: Final Inspection

  • Verify for leaks around the drain bolt, hoses, and radiator cap.
  • Reinstall the bodywork and seat.
  • Check coolant level before each ride – especially after a coolant change.

Model-Specific Tips for Your 2019 FC450HQ

  • The FC450HQ features *aluminum cylinder heads and a high-performance cooling system* – always use coolant formulated for aluminum engines to prevent corrosion and scale build-up.
  • Tight workspaces: The radiator cap sits close to the frame–use care removing and reinstalling to avoid cross-threading.
  • If the coolant level continues to drop or if you notice persistent bubbles in the reservoir, inspect for leaks or consult a technician as further diagnosis may be needed.
  • Always check the cold start mechanism is in its correct position after maintenance for optimal starting.

Protect your championship machine and ride with confidence by making coolant changes a regular part of your MotoSport garage routine.

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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.