How to Change the Coolant in a 2019 Husqvarna TC85BW

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Changing the coolant in your 2019 Husqvarna TC85BW is a crucial maintenance step to ensure proper engine cooling and performance, especially under demanding riding conditions. This guide will walk you through the coolant replacement process, highlight model-specific considerations, and offer safety tips unique to this powerful 85cc motocross machine.

Why Change the Coolant?

Regular coolant changes on the TC85BW help prevent overheating, protect internal engine components, and avoid premature system corrosion. This is particularly important for 2-stroke engines, which generate significant heat under race or trail conditions.

Required Tools & Supplies

  • Fresh coolant compatible with aluminum radiators (ethylene glycol-based or manufacturer-recommended racing coolant)
  • Drain pan
  • Screwdrivers and socket set
  • Protective gloves and eye protection
  • Clean rags

Step-by-Step Coolant Change Procedure

  1. Prepare the TC85BW:
    • Allow the bike to cool completely. Hot coolant can cause burns.
    • Place the bike securely on a level stand to ensure even draining and refilling.
    • Remove the right side cover and, if needed for better access, the fuel tank.
  2. Drain the Old Coolant:
    • Locate the coolant drain bolt at the base of the water pump (check your owner's manual or view under the right side of the engine).
    • Place your drain pan under the area and remove the drain bolt carefully; coolant will flow out rapidly.
    • Remove the radiator cap to allow the system to drain completely. Never remove the cap when hot.
  3. Flush (Optional but Recommended):
    • For best results, flush the system with distilled water. Reinstall the drain bolt, pour distilled water into the radiator, run the engine briefly, then drain again.
  4. Inspect Components:
    • Check hoses, clamps, and the radiator for leaks or damage. Now's the time to replace any failing parts.
  5. Refill Coolant:
    • Reinstall the drain bolt and tighten to the recommended torque.
    • Slowly fill the radiator with new coolant until just below the filler neck. Use a funnel to avoid spills.
  6. Bleed the Cooling System:
    • Some TC85BW models have a small bleed screw on the cylinder head or thermostat housing. Loosen this screw until air bubbles stop and only coolant flows, then retighten.
    • Rock the bike gently from side to side or squeeze coolant hoses to help release trapped air.
  7. Check Level and Inspect for Leaks:
    • Reinstall the radiator cap. Run the engine for a few minutes, shut it off, let it cool, and recheck the coolant level. Top off if needed.
    • Inspect all joints and the drain bolt area for leaks.
  8. Reassemble:
    • Reinstall the side cover and fuel tank if removed. Dispose of old coolant safely according to environmental regulations.

Special Notes for the 2019 Husqvarna TC85BW Owner

  • The TC85BW features a high-revving two-stroke engine and efficient, lightweight radiators–choose a quality coolant designed for high temperatures and racing use.
  • The cooling system is compact. Pay extra attention to bleeding air; trapped bubbles can cause overheating or coolant ejection.
  • Regularly inspect the radiator fins and clean mud or debris to optimize cooling. Bent fins can be straightened gently with a plastic tool.
  • Always flush the system before switching coolant brands/types to prevent chemical incompatibility.
  • Change coolant at least once per season or more often under extreme use (deep sand, high ambient heat, or competitive racing).

Safety & Environmental Reminders

  • Coolant is toxic to humans and animals. Rinse immediately and consult a doctor if coolant splashes in the eyes or on skin; change contaminated clothing.
  • Store coolant in original containers away from children and pets.
  • Never dump used coolant on the ground–recycle at designated facilities.

Regular coolant service will keep your 2019 Husqvarna TC85BW running cool, responsive, and ready for every ride, whether you're chasing trophies or simply enjoying the trail. Keep your machine performing at its MotoSport best.

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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.