Hello,
I have owned my GS for 81/2 years and have had little in terms of problems with the car, however, on a recent trip I have encountered a problem in the air management system. The system heats and cools fine all fan functions work properly but you hear an outside air noise and it sounds as if there is an open door allowing the outside air noise to enter the cabin. The codes that I am getting are 21, 24 however I understand code 21 may be due to not enough light at the time, excluding code 21 I have not seen code 24 on a list of default codes in this forum. Any help on where to get started would be appreciated.
Alex