How to Change the Coolant in a 2022 Suzuki DRZ400S

Shop parts for a 2022 Suzuki DRZ400S Dirt Bike.

If you own a 2022 Suzuki DRZ400S, routine cooling system maintenance is crucial for long-term reliabilityespecially if you ride trails, adventure routes, or commute year-round. Changing the coolant ensures efficient engine cooling, prevents corrosion, and helps avoid costly overheating damage. Here's a MotoSport-exclusive guide, tailored to your bike, featuring unique tips and steps for this single-cylinder thumper.

What You Need

  • Coolant (pre-mixed 50/50 ethylene glycol-based or motorcycle-specific; avoid straight water or car-only coolants)
  • Socket set (commonly 8mm, 10mm, 12mm)
  • Phillips screwdriver
  • Catch pan for old coolant
  • Clean rags
  • Gloves and safety glasses

Step-by-Step: Coolant Change Procedure

  1. Ensure engine is cool before starting. Hot coolant can cause severe burns.
  2. Remove the left side panel or fairing (if equipped) to access the radiator cap and water pump area. Use a 12mm socket for side panel bolts, if present.
  3. Remove the radiator cap. Undo the small screw (if present) securing the cap, then twist the cap off. This allows quicker draining and prevents vacuum lock during the process.
  4. Position a catch pan under the water pump.
  5. Find the coolant drain bolt on the water pump cover (a 10mm hex bolt on the right side of the engine). Loosen it and allow coolant to drain completely.
  6. Optional: For a more thorough flushespecially if switching coolant typesblow compressed air through the system or flush with distilled water and drain again. Remove hoses for access if needed.
  7. Reinstall and tighten the drain bolt (do not overtighten; 7 ft-lbs torque is typical).
  8. Locate the air bleed screw(s):
    • At the top front of the cylinder head, there may be a bleeder screw (Phillips/hex combo).
    • On some DRZs (including the 2022 DRZ400S), you may also find a bleed screw at the top of the left radiator. Some models do NOT have the water neck bleeder; if your upper water neck points straight up, you will not have this screw.
  9. Open the bleed screw(s) a few turns; do not remove completely.
  10. Pour new coolant slowly into the right radiator (main fill point). Allow air to escape out the bleed screws.
    • When coolant flows out steadily at the water neck bleed screw, snug it closed.
    • Keep filling until coolant flows from the left radiator bleed screw, then snug that too.
    • Continue filling until the radiator neck remains full.
  11. Gently rock the bike side-to-side (leaning left and right) to help purge trapped air bubbles. Top off coolant as needed.
  12. Reinstall the radiator cap securely. Replace securing screw if present.
  13. Start the engine and let it idle to operating temperaturemonitor the temperature gauge if equipped. Keep an eye on the coolant level; IF the temp rises quickly, shut off immediately to investigate for air pockets.
  14. After cooling, recheck coolant level. Top off at the radiator cap if needed.
  15. Fill the overflow bottle with about 1 inch of coolantthis catches expansion and contraction, maintaining correct system levels.

Model-Specific DRZ400S Tips

  • The 2022 DRZ400S does not have a radiator fan from the factory. Excess idling or hard enduro riding at low speed can cause it to overheat quicker than other dual-sports. Avoid letting the bike idle stationary for long after servicing the coolant.
  • If your DRZ400S is used for aggressive off-road or hot weather riding, consider fitting an aftermarket fan kit and always verify correct coolant typenever mix incompatible formulas (silicate-based and silicate-free should not be mixed).
  • The cap and overflow tank on the DRZ400S are both plasticbe gentle to avoid cracking. Inspect hoses for wear or bulges and replace if needed.
  • Check service intervals: Suzuki recommends coolant service every two years under normal use; hard off-roaders may want to check yearly.

Disposal and Safety

  • Capture and recycle all old coolant appropriately. Dispose at certified recycling or hazardous waste facilitiesnever pour into drains or soil.

Refreshing the coolant in your 2022 Suzuki DRZ400S is straightforward with a few model-specific tricks. This essential maintenance will keep your adventure seamless and your engine protected wherever you ride.

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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.