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Coolant Replacement

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the radiator cap.
  2. Open the splash shield cover (A).
    Fig 1: Identifying Splash Shield Cover & Drain Plug
    G05961183Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Loosen the drain plug (B) and drain the coolant.
  4. Remove the rocker arm oil pressure sensor cover (see step 8 on CRANKSHAFT AND PISTON REMOVAL ).
  5. Install a rubber hose (A) on the drain bolt (B) located at the rear of the engine block, then loosen the drain bolt.
    Fig 2: Rubber Hose & Drain Bolt With Torque Specifications
    G05961184Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. When the coolant stops draining, tighten the drain bolt. Remove the rubber hose, then install the rocker arm oil pressure sensor cover (see step 39 on CRANKSHAFT AND PISTON INSTALLATION ).
  7. Tighten the radiator drain plug securely.
  8. Close the splash shield cover.
  9. Remove, drain, and reinstall the coolant reservoir.
  10. Fill the coolant reservoir to the MAX mark (A) with Honda Long Life Antifreeze/Coolant Type 2.
    Fig 3: Identifying Coolant Reservoir MAX Mark
    G05961185Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Pour Honda Long Life Antifreeze/Coolant Type 2 into the radiator up to the base of the filler neck.
    NOTE:
    • Always use Honda Long Life Antifreeze/Coolant Type 2. 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. Do not add water.

      • Engine Coolant Capacities (Including the coolant reservoir capacity of 0.75 L (0.198 US gal)): 

      At Coolant Change: 

      7.5 L (1.98 US gal) 

      After Engine Overhaul: 

      9.4 L (2.48 US gal) 

      Fig 4: Filling Coolant In Engine
      G05961186Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Start the engine. Hold the engine speed at 1,500 RPM until it warms up (the radiator fan comes on at least twice). Make sure the thermostat is open.
  13. Turn off the engine. Check the level in the radiator, and add Honda Long Life Antifreeze/Coolant Type 2, if needed.
  14. Set the climate control or HVAC control unit to maximum cool. Start the engine. Hold the engine speed at 1,500 RPM for 5 minutes, then turn off the engine.
  15. Check the level in the radiator, and add Honda Long Life Antifreeze/Coolant Type 2, if needed.
  16. Set the climate control or HVAC control unit to maximum heat. Start the engine. Hold the engine speed at 1,500 RPM for 5 minutes, then turn off the engine.
  17. Check the level in the radiator, and add Honda Long Life Antifreeze/Coolant Type 2, if needed.
  18. Set the climate control or HVAC control unit to maximum cool. Start the engine. Hold the engine speed at 1,500 RPM for 3 minutes, then turn off the engine.
  19. Check the level in the radiator, and add Honda Long Life Antifreeze/Coolant Type 2, if needed.
  20. Set the climate control or HVAC control unit to maximum heat. Start the engine. Hold the engine speed at 1,500 RPM for 3 minutes, then turn off the engine.
  21. Check the level in the radiator, and add Honda Long Life Antifreeze/Coolant Type 2, if needed.
  22. Repeat steps 18 through 21 until the coolant level does not change in the radiator, then install the radiator cap loosely.
  23. Set the climate control or HVAC control unit to maximum cool. Start the engine. Hold the engine speed at 2,500 RPM for 1 minute.
  24. Set the climate control or HVAC control unit to maximum heat, and select high speed heat mode on the rear control panel. Measure the temperature of the air from the rear floor vent for 3 minutes. Make sure the temperature is above the standard line of the graph as shown. If the temperature is below the standard line, repeat steps  18 through  21 several more times. Then loosely install the radiator cap and recheck.
    Fig 5: Identifying Engine Cooling Temperature Graph
    G05961187Courtesy of AMERICAN HONDA MOTOR CO., INC.
  25. With the engine idling, make sure you do not hear the sound of water flowing near the rear heater unit. If you hear water flowing, repeat steps  18 through  21 several more times.
  26. Install the radiator cap securely.
  27. Fill the coolant reservoir with Honda Long Life Antifreeze/Coolant Type 2 up to the MAX mark on the coolant reservoir, then add an extra 0.4 L (0.11 US gal) of coolant.
  28. If the maintenance minder required engine coolant replacement, reset the maintenance minder (see MAINTENANCE MAIN ITEMS ). If the maintenance minder did not require engine coolant replacement, go to step 29.
  29. Turn the ignition switch to LOOK (0).
  30. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on (see GENERAL TROUBLESHOOTING INFORMATION ).
  31. Turn the ignition switch to ON (II).
  32. Make sure the HDS communicates with the vehicle and the powertrain control module (PCM). If it does not communicate, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
  33. Select GAUGES in the BODY ELECTRICAL with the HDS.
  34. Select ADJUSTMENT in the GAUGES with the HDS.
  35. Select MAINTENANCE INFORMATION in the ADJUSTMENT with the HDS.
  36. Select RESET in the MAINTENANCE INFORMATION with the HDS.
  37. Select MAINTENANCE SUB ITEM 5 RESET with the HDS.
  38. Clean up any spilled engine coolant.
  39. Inspect for engine coolant leaks.
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