GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Park Avenue 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Afterblow Enabling

The afterblow mode can be enabled using the scan tool. The afterblow mode allows the blower motor to operate after the engine has been turned off. This operation of the blower motor dries the evaporator core which reduces the amount of microbial growth which can create undesirable odors.

When the afterblow mode has been enabled the blower motor will pulse ON four times for 20 seconds, with 10 minutes between pulses. The following conditions must be met for afterblow to operate:

    • The outside air temperature is at least 21°C (70°F).
    • The A/C compressor was operating for longer than 3 minutes.
    • The engine has been turned off for at least 30 minutes.
    • The system voltage is at least 12 volts.

Afterblow Mode Enabling Procedure

The Scan Tool will recalibrate the heater and A/C programmer to enable the afterblow mode.

  1. Connect the Scan Tool .
  2. The ignition should be ON, but the engine should not be operating.
  3. Select Heating and Air Conditioning.
  4. Select Special Functions.
  5. Select Set Options.
  6. Select Afterblow.
  7. Select YES to enable the afterblow.