This appears to be a classic bate and switch ac service add via e-mail to lure you into the shop and drag you into an endless checks of system components and parts replacements with no clue on the usefulness of the outcome. I left my 08 VW Rabbit for the ac was still working with a delay or switching from cold to hot. After talking to the shop, the intention was to check on the ac system performance. Low pressure filler valve was replaced since leaking, but at the same time system was over charged as reported from the shop over the phone? No word on the compressor engaging or not. So, for a $102.72 they performed evac and recharge to the system which was holding pressure but reporting the compressor not engaging afterwords. Compressor was working when the car was left at the shop. Following that , they asked for additional $115.00 to see why the compressor is not working. Never heard of such service: to perform useless procedures knowing it may not work or needing to be redone if a part is to be replaced .Before starting anything on an ac system, such shell be turned on to see whether or not it works. It appears "something happened with the car while at the shop" so the compressor does not engage.