I have a 2012 plate SLK 55AMG, I bought it a couple of months ago and last year the air-conditioning condenser was replaced and it was re-gassed. Before I bought it from the garage they also re-gassed the system. It is now only blowing out slightly cool air. When you first start the air-conditioning it makes a gurgling whooshing noise which sounds odd. I do have a warranty with the vehicle but just after any pointers on here first if anyone has similar issues.