HVAC Afterblow Function Description

The HVAC afterblow function can be enabled by using the scan tool. The function lets the blower motor run after the engine has been turned off to dry the evaporator core. Microbial growth, which can create undesirable odors, can be reduced by drying the evaporator core.

The afterblow function consists of the following steps:

  1. A/C compressor On for more than 2 minutes
  2. Engine Off for more than 14 minutes
  3. Outside air temperature greater than 21°C (70°F)
  4. System voltage greater than 12 V
  5. Blower motor at 68% for 25-30 seconds
  6. Blower motor Off for 8 minutes

Steps 5 & 6 are repeated 3 times.