How to Change the Coolant in a 2009 Suzuki DRZ400S: MotoSport.com Guide
Shop parts for a 2009 Suzuki DRZ400S Dirt Bike.
Changing the coolant in your 2009 Suzuki DRZ400S is a straightforward process, but knowing a few DRZ-specific tips ensures your dirt bike stays running cool and reliable on every ride. The DRZ400S uses a liquid-cooled system, which requires periodic maintenance to prevent overheating and component wear. Follow this step-by-step, MotoSport-exclusive guide crafted just for your model year.
What You–ll Need
- Socket set (including 10mm and 12mm sockets)
- Medium-size Phillips screwdriver
- Container for old coolant
- Fresh pre-mixed 50/50 motorcycle coolant (compatible with aluminum engines and radiators)
- Protective gloves
- Rags for cleanup
Step 1: Remove the Side Cover
Start with the bike cool to the touch. Use your 12mm socket to remove the side cover. This exposes the water pump and drain bolt, simplifying access for draining the system.
Step 2: Open the Radiator Cap
Use a Phillips screwdriver to remove the small screw securing the radiator cap, then carefully take off the cap. This breaks any vacuum, allowing the coolant to flow out smoothly.
Step 3: Drain the Old Coolant
Locate the drain bolt on the water pump cover (10mm). Place your container underneath and remove the bolt, allowing the coolant to fully drain. Make sure to dispose of coolant properly since it's toxic to pets, wildlife & the environment.
Step 4: Release Air from the Cooling System
Find the air bleed screw at the top front of the cylinder head. Some 2009 DRZ400S bikes have it, while others don–t, depending on head style. If equipped, crack the screw open with a Phillips screwdriver a few turns. This helps air escape when refilling. Also check the left radiator for a separate air bleed screw.
Step 5: Reinstall the Drain Bolt
With the old coolant completely out, reinstall and snug down the water pump drain bolt.
Step 6: Fill with New Coolant
Slowly pour the new pre-mixed coolant into the right radiator. As you fill, watch the bleed screws–once coolant seeps out smoothly (free of bubbles), snug the screws down. Continue filling until the radiator is full.
Step 7: Bleed Remaining Air
Lean the bike left and right several times–this helps release any trapped air to the fill neck. Top off coolant as necessary. A DRZ-specific trick: topping off and burping the system twice prevents air pockets that could cause overheating.
Step 8: Replace the Radiator Cap
Replace the radiator cap and the small retaining screw if desired.
Step 9: Warm the Bike, Recheck Coolant
Start your DRZ400S and let it idle until it reaches operating temperature. Keep an eye on the temperature and check for leaks. Shut off the engine and allow to cool. Open the radiator cap once more and top off the coolant if needed, and fill the overflow bottle to the marked level.
DRZ400S-Specific Tips & Notes
- The DRZ400S does not have a thermostat, so coolant circulation begins as soon as the engine runs.
- Some early/alternate heads do not use air bleed screws–simply bleed air by filling slowly and leaning the bike side to side.
- Always use coolant suitable for aluminum radiators & engines (silicate-free, pre-mixed or diluted with distilled water).
- Inspect hoses and clamps during this service. Replace worn-out parts for maximum reliability.
With regular coolant changes, your 2009 Suzuki DRZ400S delivers better performance and protection ride after ride. For all your OEM or aftermarket parts & upgrades, trust MotoSport for fast shipping and expert support.
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.