Where do you add freon in your Volkswagen jetta?

Never add freon to your own car. This is very dangerous and can kill you. A/C systems are very high pressure and If you buy a freon kit to add freon to your car. It will be propane which is highly flammable. Take it to a dealer to get it done. Also if you ever add it and it is leaking out then it can explode if it gets near a spark.