Now that is really good info NewBMWownr. You are spot on with those specs. A full evacuate and re-charge of refrigerant took exactly 1.3lbs. It's right on the repair invoice. Good stuff. Are u a tech? I am really tempted to print out your response and bring it down to the dealership and give it to my SA when I go back in a few weeks. An evaporator question for those in the know regarding the location: Is it behind the dash on an E92 coupe? I have the Bentley service manual for the car and there is an exploded diagram of the whole system under the caption- A/C components in the engine compartment.
Evaporator is shown. Maybe I can scan that and post it up.

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2009 328xi Coupe-Sport Pkg--Cold Weather Pkg-Brushed Aluminum Trim