Flushing Procedure

IMPORTANT:

Remove the coolant thermostat before flushing the cooling system. Refer to Thermostat Replacement (4.3L) .
Dispose of the used engine coolant properly.
- Store the used engine coolant in a used coolant holding tank, while awaiting approved disposal methods.
- Do not pour used engine coolant down the drain.
  - Dex-Cool® antifreeze is a very toxic chemical.
  - Disposal into a sewer system or contaminating the ground water is both environmentally irresponsible and illegal.

There are different methods to flush the cooling system. Back flushing is recommended. Special equipment is available. Follow the equipment manufacturer's instructions for use.