How do you change heater core on 2004 Pontiac Grand Am?

  1. Disconnect the negative battery cable............................

  2. Drain the cooling system into a clean container for reuse.
  3. Raise and safely support the vehicle.
  4. Remove the drain tube from the heater housing.
  5. Disconnect the heater hoses from the heater core.
  6. Lower the vehicle.
  7. Remove or disconnect the following:

    Console, if equipped Sound insulators from both sides Steering column opening filler Air outlet duct Rear floor air outlet screws and the outlet Heater core cover Heater core-to-housing mounting clamps and the heater core