Please help - thinking I am having Auditory Hallucinations

[hays0023]

I have a 2009 E92 M3 and have been having all sorts of issues with my AC. 2 weeks ago, it was diagnosed that the evaporator needed replacing and it took almost 10 days to diagnose/replace.


After the replacement, I noticed that I am having great airflow coming out of the ashtray area - I am guessing that it is just ductwork that needs connected properly.

Here is my real problem...Since picking it up, I notice a weird 'chugging' noise as I am accelerating. The only aftermarket equipment that I have is a Vorsteiner exhaust. I am not sure if I am hearing anything different, it is just that I did not notice the 'chugging' noise prior to the latest round with the AC.


If anyone has any insight as to what I might ask the dealership to look at tomorrow when I take it in, I would greatly appreciate it.

Thx