How to Change the Coolant on a 2018 Husqvarna FE501HQ: Step-by-Step Guide

Shop parts for a 2018 Husqvarna FE501HQ Dirt Bike.

Maintaining the cooling system of your 2018 Husqvarna FE501HQ is critical to reliable performance, engine longevity, and safe operation–especially when riding demanding trails. This proprietary MotoSport guide walks you through the process, highlights nuances of your FE501HQ, and includes tips to ensure a professional, mess-free coolant swap.

Tools & Supplies Needed

  • Fresh motorcycle coolant compatible with aluminum engines (avoid mixing coolants)
  • Ratchet and socket set or spanners
  • Drain pan
  • Clean rags
  • Funnel
  • Safety gloves and eyewear

Preparation

  • Ensure the bike is completely cool. Pressure in the system can cause burns and spills.
  • Park the FE501HQ on a level surface using a bike stand or secure on the sidestand if the manual recommends (bike position can affect draining efficiency in Huskies).
  • Remove the right side cover and seat if they obstruct access to the radiator or reservoir (the FE501HQ design may require this step).

Draining the Old Coolant

  • Locate the radiator cap (typically on the right side) and the drain bolt below the water pump area.
  • Slowly loosen and remove the radiator cap to release pressure from the system.
  • Place a drain pan under the drain bolt. Remove the bolt to allow coolant to flow out. For more complete draining, gently lean the bike if needed – your FE501HQ's frame allows careful movement without risk.
  • If your model includes a reservoir, unplug the breather hose and allow the overflow tank to fully empty.
  • Inspect the old coolant for contaminants—cloudiness, rust, or oil indicate system issues that may need professional inspection before refilling.

Flushing (Recommended)

  • After draining, refill the radiator with distilled water, run the bike briefly (1-2 minutes), cool, and re-drain to flush contaminants.
  • Repeat until water drains clear.

Refilling with Fresh Coolant

  • Install and tighten the drain bolt (replace the washer if worn).
  • Using a funnel, pour new coolant into the radiator slowly until it reaches the base of the filler neck.
  • Fill the reservoir to the correct line if equipped.
  • Reinstall the radiator cap securely.

Bleeding Air from the System

  • Start the engine and let it idle. As the bike warms up, trapped air will escape into the reservoir, replaced by coolant.
  • Monitor coolant level. If it drops, top it up as necessary.
  • Allow the engine to reach normal operating temperature (radiator fan kicks in or thermostat opens). Then, cool the engine completely and recheck the coolant level both at the radiator and reservoir.
  • Repeat the process if the level drops again. The system should stabilize after one or two cycles – continued loss can indicate a leak or head gasket problem.

FE501HQ-Exclusive Maintenance Notes

  • The FE501HQ features robust aluminum radiators and a pressurized cooling system. Only use manufacturer-approved coolant to prevent corrosion and electrolysis.
  • Careful handling of plastic radiator guards and shrouds is important—these can warp or crack if over-tightened during reinstallation.
  • Inspect hoses and clamps for wear during the service. Early replacement prevents roadside failures on this high-compression, performance-oriented Austrian single.

Disposal & Aftercare

  • Never dispose of coolant in drains or soil. Use a certified recycling center to protect the environment.
  • Test ride the FE501HQ, keeping an eye on gauge/indicator lights for overheating. Recheck coolant levels after your first ride.

With these steps, your 2018 Husqvarna FE501HQ will remain ready for the toughest rides. For replacement hoses, radiator caps, and approved coolants, remember – Shop parts for a 2018 Husqvarna FE501HQ Dirt Bike.

Related Shopping Categories

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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.