How to Change the Coolant in a 2020 Husqvarna TC85

Shop parts for a 2020 Husqvarna TC85 Dirt Bike.

Regularly replacing the coolant in your 2020 Husqvarna TC85 helps prevent overheating, corrosion, and costly repairs–keeping your two-stroke ripper running at peak performance. The TC85 features a compact, dual-radiator system with bleed screws to ensure proper air removal, so following the correct procedure is essential for long-term engine health.

What You’ll Need

  • Fresh coolant (ethylene glycol-based, non-silicate motorcycle coolant is recommended for this model)
  • 8mm wrench or socket
  • Flathead screwdriver (to open bleed screw, if needed)
  • Funnel
  • Catch pan for old coolant
  • Shop towels
  • Torque wrench (recommended)
  • New crush washer (optional but recommended)

Step-by-Step Coolant Change Procedure

  1. Ensure Engine Is Cool
    Never open the radiator cap or drain coolant when the engine is hot—wait for the bike to cool fully to avoid burns and pressure release injuries.
  2. Position the Bike
    Place your TC85 on a stable stand on level ground. Position a catch pan under the right-side water pump cover drain screw.
  3. Remove Radiator Cap
    Gently remove the radiator cap to allow air in so coolant drains freely. Open slowly to relieve any residual pressure.
  4. Drain the Coolant
    With an 8mm wrench, loosen and remove the coolant drain screw at the bottom of the water pump cover. Allow coolant to flow into the catch pan until dripping stops.
    Pro tip: Remove the left radiator bleed screw (flathead or small socket) on top of the left side of the head to allow trapped coolant and air to exit more thoroughly.
  5. Inspect Components
    Check the drain screw’s crush washer. Replace if damaged or worn. Wipe any debris away from sealing surfaces.
  6. Reinstall the Drain Screw
    If using a new washer, install it now. Tighten the drain screw securely (torque specification: 10 Nm / 7.4 ft-lb).
  7. Refill Coolant
    Using a clean funnel, slowly fill the radiator neck with fresh coolant. The TC85 system holds about 0.95 liters (1 US quart). Pour until the fluid sits just above the radiator core.
  8. Bleed the Cooling System
    To remove trapped air, open the left-side cylinder head bleeder screw slightly until coolant seeps out—then close once air bubbles are gone. Top off the radiator as needed.
    Check the level again after a minute, as coolant may settle once initial air escapes.
  9. Reinstall the Radiator Cap
    Tighten the cap securely.
  10. Run Engine & Verify
    Start and idle the bike for several minutes. Check for leaks and listen for abnormal sounds. Shut off and recheck coolant level once the engine cools, topping up if needed.
    Dispose of used coolant safely—it is toxic to pets and the environment.

Model-Specific Tips for the 2020 Husqvarna TC85

  • The TC85's dual radiators provide efficient cooling but also mean trapped air can be a concern–always bleed at the cylinder head bleeder screw each time you change or top up coolant.
  • Use only compatible motorcycle coolant–avoid automotive or silicate-based products that can damage water pump seals and aluminum components.
  • Inspect radiator hoses for swelling or cracking during coolant changes, as failure is common in high-revving youth motocross machines.
  • Changing coolant more frequently is recommended if you ride in muddy, sandy, or abrasive environments, as debris can cause cooling and sealing issues.

Stay Ready for Your Next Moto.

Routine coolant changes protect your investment and keep your TC85 performing at its best on the track or trail. If you need replacement parts, upgraded hoses, or premium coolants, get everything for your 2020 Husqvarna TC85 in one spot at MotoSport–saving you time and hassle.

Related Shopping Categories

Shop Radiators for a 2020 Husqvarna TC85 Dirt Bike.

Shop Coolant for a 2020 Husqvarna TC85 Dirt Bike.

Shop Temperature Sensors for a 2020 Husqvarna TC85 Dirt Bike.

Shop Tools for a 2020 Husqvarna TC85 Dirt Bike.

Shop Radiator Hoses for a 2020 Husqvarna TC85 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.