Coolant Replacement

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2009 Honda S2000, 2008 Honda S2000, 2007 Honda S2000, 2006 Honda S2000, and 2005 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.

Start the engine. Set the heater temperature control dial to maximum heat, then turn off the ignition switch. Make sure the engine and radiator are cool to the touch.
Remove the radiator cap.
Loosen the drain plug (A), and drain the coolant.

Fig 1: Identifying Drain Plug & Coolant
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the drain bolt (A) from the right side of the engine block.

Fig 2: View Of Drain Bolt From Right Side Of Engine Block With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
After the coolant has drained, apply liquid gasket, P/N 08718-0009, to the drain bolt threads, then reinstall the bolt with a new washer and tighten it securely.
Tighten the radiator drain plug securely.
Remove, drain, and reinstall the reservoir. Fill the tank to the MAX mark with Honda Long Life Antifreeze/Coolant Type 2 (P/N OL999-9001).
Remove the bleed cap (A) from the heater bypass tube.

Fig 3: Identifying Bleed Cap & Heater Bypass Tube
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Loosen the air bleed bolt (A) in the intake manifold, then pour Honda Long Life Antifreeze/Coolant Type 2 into the radiator to the bottom of the filler neck. Do not let coolant spill on any electrical parts or the paint. If any coolant spills, rinse it off immediately.
NOTE:
- Always use Honda Long Life Antifreeze/Coolant Type 2 (P/N OL999-9001). Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.
- Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50% antifreeze and 50% water. Premixing is not required.
Engine Coolant Refill Capacities

(including reservoir capacity of 0.6 L (0.16 US gal))

After Coolant Change: 6.5 L (1.72 US gal)

After Engine Overhaul: 7.6 L (2.01 US gal)

Fig 4: Air Bleed Bolt In Intake Manifold With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Tighten the air bleed bolt as soon as coolant starts to run out in a steady stream.
Reinstall the bleed cap on the heater bypass tube as soon as coolant starts to run out in a steady stream.
With the radiator cap off, start the engine and let it run until warmed up (radiator fan comes on at least twice). Then, if necessary, add more Honda Long Life Anti-freeze/Coolant Type 2 to bring the level back up to the bottom of the filler neck.
Put the radiator cap on tightly, then run the engine again and check for leaks.
Clean up any spilled engine coolant.