Blocked cooling system passages will reduce cooling system efficiency and possibly cause engine over-heating.


  • Effectively aid in the removal of rust and scale build-up inside the radiator and engine cooling passages
  • A clean cooling system will result in improved engine efficiency and heater output
  • Works best when used with a cooling system flush machine
  • Meets & exceeds OEM service requirements


APPLICATION: Ensure the coolant level is below the overflow level prior to adding fluid. Pour the entire container of ACDelco Radiator Fast Flush into the radiator. Do not add product to the overflow tank. Run engine at fast idle for 10 minutes. Open the block and radiator petcocks to drain entire system. Flush the system until clean water runs from all outlets. Close all petcocks. Refill system. DO NOT RUN COLD WATER INTO HOT ENGINE!