This guide will help in replacing 3 things: the compressor, expansion valve, and ac receiver drier for your 2007 VW Jetta. I am by no means a mechanic at all but this task isn't too hard.The only hard part about this was replacing the expansion valve because it is behind the motor and it is really cramped in there.
This guide will not be an extremely detailed how-to but it will provide enough grounds to accomplish this task. Before I begin I will say that 2 steps are missing and will not be included. One of the steps that will not be included will be the step that shows you how to remove the splash guard that goes under the your engine basically. It does what the name implies. It protects all the parts like the engine, battery, fuses, etc. from contact with water. I won't show this step because my Jetta didn't have a splash guard. I know. The other step that will not be included is the step called the "ac flush". In this step you just flush the ac lines with a special fluid called "ac flush" but these I didn't include because I had to take it to a mechanic to do that part since I didn't have the required tools and disposal. You are apparently not to dispose ac fluid into the ground, drain, etc. because it is against the law, just like oil.
Step 1: Components Needed
To do this job you will need of course a new or remanufactured ac compressor for your Jetta, an expansion valve and an ac receiver drier which is that black tube. I got this at O'reilly auto parts for around $450 for the ac compressor. If you know some friends that work there and are really cool with you then they can give you their employee discount which is a really sweet deal but I am saying that I got this for the price mentioned. It is new but you can also get it remanufactured for about half the price. The compressor came with a flush agent used to clean the ac lines, a pack of o-rings, a lubricant, and oil. The expansion valve also came with the compressor. I guess I needed to change that too. The ac receiver drier is bought separately also at O'reilly. It is around $15.