How to Change the Coolant in a 2018 Husqvarna TC85BW

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Regular coolant changes ensure your 2018 Husqvarna TC85BW runs cool even in aggressive MX or enduro riding. This guide provides a step-by-step process unique to this MMY, highlighting key model notes that every owner should know before servicing their bike.

Preparing the Bike

  • Let the engine cool fully before starting. Hot coolant can cause severe burns.
  • Work on a stable, level surface. Use a stand to keep the bike upright for accurate draining and filling.

Tools & Supplies Needed

  • Socket or T-handle wrench (for radiator drain bolt)
  • Drain pan
  • Fresh coolant (silicate-free, ethylene glycol-basedmany prefer Engine Ice or equivalent)
  • Funnel
  • Clean water (distilled, for optional flush)
  • Rags or shop towels
  • Safety gloves and eye protection

Step-by-Step Coolant Change

  1. Remove the side covers and fuel tank if needed to access the radiator cap. The TC85BW design allows fairly open access, but working room helps prevent spills.
  2. Relieve pressure by slowly loosening the radiator cap. Open the cap only when the engine is cold to prevent pressurized coolant from spraying out.
  3. Locate the coolant drain bolt. On the TC85BW, this is on the water pump cover at the bottom of the right engine case. Position your drain pan directly beneath it.
  4. Remove the drain bolt and allow all coolant to drain. Open the radiator cap fully for faster flow.
  5. Optional: To flush, reinstall the drain bolt finger-tight, fill the radiator with clean distilled water, and briefly run the engine (30-60 seconds). Shut it off, let cool, remove the drain bolt again, and drain out the rinse water.
  6. Reinstall the drain bolt, tightening to the specified torque for your model. (Avoid overtighteningcheck your owner's manual for exact value.)
  7. Fill the radiator with fresh coolant. Pour slowly to allow air to escapefilling the TC85BW's system typically takes about 0.60 liters. Use a funnel to avoid spills.
  8. Bleed air from the system: On small-bore Husqvarna models, air pockets can cause hot spots. After filling, gently rock the bike side-to-side and upright. Some TC85s have a small bleeder screw on or near the cylinder headcrack this open slightly to let trapped air escape, then retighten when coolant oozes out without bubbles.
  9. Top off coolant to the base of the radiator neck, then replace and tighten the cap.
  10. Start the engine and let it idle for one to two minutes, monitoring for leaks. Shut off, allow to cool, and recheck coolant leveltop up if necessary.

Model-Specific Notes for the TC85BW

  • Wide Wheel Advantage: The TC85BW uses a wider rear wheel and tire, common in supermini classes. This slightly higher thermal load makes regular coolant service and a system free of air pockets critical.
  • Coolant Capacity: The TC85BW takes approximately 0.60 liters of coolant. Avoid overfilling.
  • Check for radiator fin damage or clogging. The TC85 is often raced in sand or mud, so always inspect and clean radiator fins, and straighten any bent ones for optimal cooling performance.
  • Frequent Maintenance: Husqvarna recommends more frequent piston and coolant changes if the bike is ridden in sand. Keep intervals short for high-performance use.

Safety Reminders

  • Coolant is toxicavoid skin and eye contact and clean any spills immediately.
  • Dispose of old coolant responsibly at a qualified recycling or hazardous waste facility.

Routine maintenance like coolant changes keeps your TC85BW running fast, reliable, and cool in any conditions. For OEM and performance parts engineered for your bike, shop parts for a 2018 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.