Bulletin No.: 07-01-38-003
Date: June 12, 2007
Some customers may comment that the Air Conditioning (A/C) indicator on the Heating Ventilation and Air Conditioning (HVAC) Control Module flashes then turns off after they press the A/C button. Others may comment that the Recirculation indicator on the HVAC Control Module flashes then turns off after they press the Recirculation button.
This is normal operation for the HVAC Control Module and indicates that the A/C or Recirculation function is not available at this time.
Reasons that the A/C may not be available (calibrated values vary by program) are listed below. Consult the appropriate vehicle Service Information (SI) for detailed HVAC Description and Operation:
Ambient Air Temperature is too low (if equipped with Ambient Air Temperature Sensor)
Vehicle voltage less than 9.5 volts
Refrigerant Pressure too low
Refrigerant Pressure too high
Engine Coolant Temperature too high
Engine is not in RUN
HVAC Control Head is in the OFF position
Reasons Recirculation may not be available: Mode switch in Floor, Defog or Defrost mode.
The reason(s) A/C is currently disabled can be viewed with a Tech 2(R) by navigating to HVAC Data display and viewing the "A/C Permission" parameter.
Do not replace the HVAC Control Module for a flashing A/C Indicator or flashing Recirculation Indicator, as this is normal operation.
I really dont think its a charge issue. I work at a BMW dealer and have already recharged it twice this year, the 2nd time just yesterday. The system holds 1.27 lbs and we recovered 1.16 lbs, so i really dont think its a low refrigerant level issue. I'm leaning towards either a pressure sensor or something to do w/ the throttle body, due to the problem seems to start after a heavy accel or WOT(wide open throttle). Thats when the A/C shuts off and doesnt come back on. If you then try and press the A/C on button, it just blinks and will not come back on.