How To Quickly Flush Coolant System in 3 Minutes!

Quickly Flush Your Coolant System

If you’re wondering how to flush the coolant system for any car, you’ve come to the right place! I’ll be showing you how to flush the coolant system and how to bleed air out of the system using a Honda Prelude Type SH (1997-2001) BB6.

Video Tutorial

Step-By-Step Guide:

  1. Raise the car up on Jack Stands.
  2. Set the Heat to max so it’ll open the Heater Core to release coolant.
  3. While the engine is cool, remove the Radiator Cap otherwise you may get burn’t.
  4. Loosen the Drain Plug from the bottom of the Radiator to flush the coolant from the system.
  5. Honda Prelude Base Model ONLY: Remove the drain bolt from the back of the Cylinder Block to flush the coolant out of the system and then reinstall the Drain Bolt with Liquid Gasket.Coolant Drain Bolt (Honda Prelude Base Model Only)
  6. Remove and drain the Reservoir of coolant. Fill the reservoir to MAX line with premixed (50/50) coolant. 
  7. Now loosen the Air Bleeder Bolt (12mm) on the Thermostat Housing and tighten the Drain Plug on the bottom of the Radiator.
  8. Fill the Radiator with coolant to the bottom of the filler neck and tighten the Air Bleeder Bolt as soon as coolant starts to run out in a steady stream.
  9. With Radiator Cap off, start the engine and let it run until its warmed up (when the Radiator fan comes on at least twice). Keep refilling the Radiator with coolant if it keeps going down and be sure to occasionally squeeze the upper Radiator Hose to burp out any air pockets.
  10. Reinstall the Radiator Cap when coolant seems to be overflowing the Radiator.
  11. Finished when the Radiator fan comes on.
Awesome! You’ve successfully flushed the cooling system of your car and learned how to bleed the system. In case you have any suggestions on this write-up, feel free to leave a comment below. If you’d like a tutorial on something else, you can Contact Us via email.

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