Honda - Accord Prelude 1996 2000

Cooling System

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CAUTION
Never remove the radiator cap under any conditions while the engine is hot! Failure to follow these instructions could result in damage to the cooling system, engine and/or personal injury. To avoid having scalding hot coolant or steam blow out of the radiator, use extreme care whenever removing the radiator cap. Wait until the engine has cooled, then wrap a thick cloth around the radiator cap and turn it slowly to the first stop. Step back while the pressure is released from the cooling system. When the pressure has been released, press down on the radiator cap (with the cloth still in position), then turn and remove the cap.



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Fig. Cutaway view of a typical cooling system flow



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Fig. Cooling systems should be pressure tested for leaks periodically



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Fig. The numbers "1.1" on the radiator cap indicate the rated holding pressure of the radiator cap measured in atmospheres. This cap is rated at 1.1 times atmospheric pressure (1.1 x 14.7) or 16 psi

FLUID RECOMMENDATIONS



The first recommended cooling system fluid change is 45,000 miles (72,000 km) or 3 years whichever occurs first. Thereafter, the interval is every 30,000 miles (48,000 km) or 2 years, whichever occurs first. The cooling system should be inspected, flushed and refilled with fresh coolant during these maintenance intervals.

The manufacturer recommends using 50% Honda Antifreeze/Coolant mixed with 50% water. A high quality major-brand, non-silicate designed for use in aluminum engines can be substituted temporarily. Using distilled water instead of regular tap water to mix with the antifreeze will also help to keep the cooling system corrosion free, as some of the chemicals found in tap water may corrode aluminum. In addition, if the coolant is left in the system too long, it loses its ability to prevent rust and corrosion.

LEVEL CHECK



To check the coolant level, simply verify whether the coolant is up to the FULL line on the expansion tank. Add the proper mixture of coolant to the expansion tank if the level is low. Never add cold water or coolant to a hot engine as damage to both the cooling system and the engine could result.


CAUTION
Should it be necessary to remove the radiator cap, make sure the system has had time to cool, reducing the internal pressure.

The radiator cap should be removed only for cleaning or draining the system. The cooling system is under pressure when Hot. Removing the radiator cap when the engine is warm or overheated will cause coolant to spill or be forced out, possibly causing serious burns. The system should be allowed to cool before attempting removal of the radiator cap or other cooling system components.

If any coolant spills on painted portions of the body, rinse it off immediately.



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Fig. If the coolant level is low, remove the coolant reservoir tank cap . . .



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Fig. . . . then add coolant to the reservoir

DRAIN & REFILL





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Fig. Using your fingers, loosen the pet cock to drain the radiator



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Fig. Allow the coolant to drain into an approved container


CAUTION
When draining the coolant, keep in mind that small animals and domestic pets are attracted by ethylene glycol antifreeze and may attempt to drink any that is left in an uncovered container or from puddles on the ground. This can be fatal if ingested in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused until it becomes contaminated or several years old. To avoid injuries from scalding fluid and steam, DO NOT remove the radiator cap while the engine is running or if the engine or radiator is still hot.

  1. Before draining the cooling system, place the heater's temperature selector to the full WARM position while the engine is running.
  2.  
  3. Turn the engine off before it gets hot and the system builds pressure.
  4.  
  5. Make sure the engine is still cool and the vehicle is parked on a level surface.
  6.  
  7. Remove and drain the reservoir recovery tank.
  8.  
  9. Place a fluid catch pan under the radiator. Turn the radiator brainsick counterclockwise to open, then allow the coolant to drain.
  10.  
  11. Remove the radiator cap by performing the following:
    1. Slowly rotate the cap counterclockwise to the detent.
    2.  
    3. If any residual pressure is present, WAIT until the hissing stops.
    4.  
    5. After the hissing noise has ceased, press down on the cap and continue rotating it counterclockwise to remove it.
    6.  

  12.  



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Fig. Clean the radiator cap's rubber gasket of any dirt to achieve a proper seal

  1. Allow the coolant to drain completely from the vehicle.
  2.  
  3. Close the radiator brainsick.
  4.  

When filling the cooling system, be careful not to spill any coolant on the drive belts or alternator.

To refill:

  1. Make sure the heater temperature is placed in the full hot position.
  2.  
  3. On 2.2L and 2.3L engines, open the bleed screw on the thermostat housing.
  4.  
  5. Install the reservoir recovery tank and using a 50/50 mixture of the recommended antifreeze and distilled water, fill the cooling system reservoir tank to the FULL mark.
  6.  


WARNING
If any coolant is spilled on a painted surface of the vehicle, wipe it up immediately.

  1. Begin filling the radiator with the 50/50 mixture of coolant. On the 2.2L and 2.3L engines, watch for air being released from the open the bleed screw on the thermostat housing. Once coolant mixture begins to steadily flow through the bleeder, close the bleeder.
  2.  
  3. Continue to fill the radiator until the radiator is full.
  4.  
  5. Start the engine and allow the engine to run until the cooling fans operate two times, making sure to top off the system as the fluid level drops.
  6.  



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Fig. Be sure to fill the cooling system to the bottom of the filler neck with a 50/50 mixture of ethylene glycol (or other suitable) antifreeze and water. Always use a funnel to avoid spills



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Fig. Also, fill the coolant recovery tank to the proper level

  1. After the cooling fan has run for the second time, top off the system as necessary, then install the radiator cap.
  2.  
  3. Allow the engine to run and inspect the cooling system for leaks.
  4.  



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Fig. Always check the condition of the radiator cap gasket and seal. Place a light coating of coolant on the seal and gasket when installing

FLUSHING & CLEANING





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Fig. Firmly grasp the radiator cap and turn it counterclockwise to remove



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Fig. Twist the cap to the position shown or until the tension is relieved . . .



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Fig. . . . then remove the radiator cap



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Fig. Always use a funnel while refilling the cooling system to prevent spills

  1. Drain the cooling system, as described in the preceding drain and refill procedure.
  2.  
  3. Close the drain valve.
  4.  

A flushing solution may be used. Ensure that it is safe for use with aluminum cooling system components, and follow the directions on the container.

  1. If using a flushing solution, remove the thermostat, then reinstall the thermostat housing.
  2.  
  3. Add sufficient water to fill the system.
  4.  
  5. Start the engine and run it for a few minutes. Drain the system.
  6.  
  7. Allow the water to flow out of the radiator until it is clear.
  8.  
  9. Reconnect the heater hose.
  10.  
  11. Drain the cooling system.
  12.  
  13. Reinstall the thermostat.
  14.  
  15. Empty the coolant reservoir or surge tank and flush it.
  16.  
  17. Fill the cooling system, using the correct ratio of antifreeze and water, to the bottom of the filler neck. Fill the reservoir or surge tank to the FULL mark.
  18.  
  19. Install the radiator cap.
  20.  

 
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