How to Change the Coolant in a 2025 Husqvarna TC85BW

Shop parts for a 2025 Husqvarna TC85BW Dirt Bike.

Proper coolant maintenance is one of the most important tasks for getting the best performance and longevity from your 2025 Husqvarna TC85BW. The 2025 model features brand-new Pankl radiators, an updated cylinder head, and a crankcase design that uses coolant not just through the cylinder, but also routed through the crankcases for maximum thermal management . Below, you'll find a MotoSport-exclusive, step-by-step guide to flushing and replacing the coolant, plus key things to note about this year's TC85BW.

What You Need

  • Fresh coolant formulated for aluminum engines (consult owner's manual for recommended type)
  • Drain pan
  • Ratchet and socket set
  • Screwdriver
  • Gloves & safety glasses
  • Clean rags

Before You Begin

  • Make sure the engine is completely cool before starting. Hot coolant can cause severe burns.
  • Place the bike on a stable stand in a well-ventilated area.
  • Review the owner's manual for coolant specs and disposal recommendations.

Step 1 – Remove the Radiator Covers

  • Using a screwdriver, remove the bolts securing the radiator covers as shown in your maintenance manual .
  • Set aside the covers and screws.

Step 2 – Drain the Old Coolant

  • Locate the coolant drain bolt, typically found at the lowest point of the water pump cover on the right side of the engine.
  • Place your drain pan beneath the engine, then use the correct socket to carefully remove the drain bolt and its copper washer.
  • With the radiator cap removed (usually on the left side, top of the radiator), the system will drain faster due to air flow.
  • Allow all coolant to fully drain. Gently rock the bike side-to-side to get every drop out.

Step 3 – Inspect Drain Bolt & Crush Washer

  • Examine the drain bolt and washer. Replace if damaged or excessively worn. This helps prevent leaks.
  • Reinstall the drain bolt and torque it to the manufacturer's specification.

Step 4 – Check Radiator Fins

  • With covers removed, inspect the new lightweight Pankl radiator fins for debris or damage. 
  • Carefully straighten bent fins and gently clean to maintain optimal cooling. 

Step 5 – Refill with Fresh Coolant

  • Slowly pour fresh coolant into the radiator until it reaches the bottom of the filler neck. Take care not to spill; if you do, rinse off immediately and change contaminated clothing. 
  • Use a funnel for accuracy.
  • Bleeding air from the system: The TC85BW is equipped with a bleeder port near the top of the cylinder headcrack this gently while filling to release trapped air until only liquid escapes, then close the port.
  • After bleeding, top off coolant as needed.

Step 6 – Reinstall Radiator Cap and Covers

  • Confirm that the coolant is at the proper level (check the manual for the correct cold level mark).
  • Securely reinstall the radiator cap.
  • Reattach radiator covers and tighten all fasteners to spec.

Step 7 – Start & Recheck

  • Start the engine and let it idle a few minutes. Turn off and allow to cool. Recheck the coolant level.
  • If necessary, top up coolant after any last air pockets escape. Replace cap and confirm no leaks.

Model-Specific Notes for 2025 Husqvarna TC85BW

  • The 2025 model's updated radiators and crankcase cooling provide even more consistent temperature controlcritical for rigorous riding or racing. 
  • Pay special attention to the lightweight radiator finsthese are effective but can be bent by debris or crashes. Regular checks help maintain optimal cooling. 
  • If riding in sandy or muddy conditions, increase your inspection frequency: sand and dirt buildup in the radiator can impact cooling efficiency. 
  • Dispose of old coolant responsibly. Many local auto parts stores will accept used engine coolant for recycling.

Safety Reminders

  • Coolant can be toxic – clean up any spills promptly and keep out of reach of children and pets.
  • Wear gloves & eye protection while performing maintenance.
  • If you get coolant in your eyes, flush with water for at least 15 minutes and seek medical attention immediately. 

Routine coolant changes and checks will keep your TC85BW running at its championship-winning best—on and off the track.

Related Shopping Categories

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Shop Tools for a 2025 Husqvarna TC85BW Dirt Bike.

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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.