My car blows cold air while in idle,but warm air while driving. (2000 s-type) I was told by the mechanic at a repair shop that specializes in jaguars that I needed a expansion valve and a receiver drier.And the cost would be $1250. I looked online and the cost is just $40 for both. Can anyone tell me where parts are located,and how to replace them. I was considering doing it myself!