How to Change the Coolant in a 2015 Husqvarna FE350HQ

Shop parts for a 2015 Husqvarna FE350HQ Dirt Bike.

Performing a coolant change is an essential maintenance step to keep your 2015 Husqvarna FE350HQ's engine operating at its best and protected from overheating or freezing. This step-by-step guide is tailored specifically for the FE350HQ, addressing its features and what owners should pay attention to during the process.

Tools & Supplies Needed

  • New engine coolant (preferably motorcycle-specific)
  • Drain pan
  • 10 mm socket or wrench
  • Clean water for flushing (distilled recommended)
  • Rags or paper towels
  • Funnel
  • Torque wrench (optional but recommended)
  • Gloves and eye protection

Step 1: Ensure Safety & Preparation

  • Allow the bike to cool completely before starting. Never open the radiator cap when hot – this can cause burns from pressurized steam and hot fluid.
  • Set your FE350HQ upright on a level surface, using a stand if possible.
  • Place the drain pan under the engine, aligning it with the water pump area.

Step 2: Remove the Radiator Cap

  • Locate the radiator cap, positioned on the left radiator just above the radiator fins.
  • Slowly unscrew the cap to release any residual internal pressure.

Step 3: Drain the Old Coolant

  • Find the coolant drain bolt on the water pump cover.
  • Using your 10 mm wrench, carefully loosen and remove the drain bolt along with its washer.
  • Allow coolant to fully drain into the pan. Open the cap on the overflow tank to accelerate draining if equipped.

Step 4: Flush the System (Recommended)

  • Reinstall the drain bolt temporarily after the initial fluid stops draining.
  • Fill the radiator with clean water. Reinstall the cap, run the engine briefly (about a minute) to circulate the flush, then shut the bike off and let it cool.
  • Remove the drain bolt again and drain out the water, repeating as needed until runoff is clear.

Step 5: Reassemble and Refill

  • Inspect the drain bolt washer and replace it if damaged to prevent leaks.
  • Reinstall the drain bolt and tighten to approximately 10 Nm (7.4 lb-ft) for the FE350HQ.
  • Using a funnel, slowly refill the radiator with the new coolant, filling up to the bottom of the radiator neck.
  • If your model is equipped with an overflow reservoir, fill it up to the indicated level as well.

Step 6: Bleed Air & Check Levels

  • With the radiator cap off, gently rock the bike side-to-side or squeeze hoses to help release trapped air.
  • Start the engine and let it idle with the cap off. Look for air bubbles escaping as coolant circulates. Top up if the level drops.
  • Once air bubbles stop, shut off the bike, allow it to cool, and top off coolant to the bottom of the neck.
  • Securely reinstall the radiator cap.

Step 7: Inspect for Leaks & Dispose of Old Coolant

  • Start the bike and verify there are no leaks from the drain bolt, hoses, or radiator.
  • Dispose of old coolant per local environmental regulations - never pour it down drains or into the ground.

Notes for 2015 Husqvarna FE350HQ Owners

  • The FE350HQ shares many design cues with KTM models but has Husqvarna-specific radiator shrouds and mounting arrangements. Take extra care when removing fairings to avoid damaging plastic tabs.
  • Ensure you use a high-quality, motorcycle-specific coolant – avoid automotive coolants with silicates, as these may damage seals and water pump components.
  • Factory torque specs for the drain bolt (10 Nm) are important for preventing leaks or damage to the water pump cover threads.
  • Check your radiator for bent fins and clean any debris. The FE350HQ is known for its efficient cooling system, but airflow is critical, especially if riding in mud or slow technical terrain.
  • Inspect hoses for signs of wear or cracking. 2015 models are several years old, and OEM hoses are prone to fatigue.

Final Check

  • Take the bike for a short, gentle ride, allow it to cool, and recheck coolant level.
  • Address any leaks or unexpected drops in level before returning to full use.

Related Shopping Categories

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Shop Radiator Hoses for a 2015 Husqvarna FE350HQ Dirt Bike.

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.