1. Open the hood of your Jaguar S-Type.
2. Locate the air conditioning compressor. It is located on the front of the engine, on the passenger side.
3. Find the low pressure port on the compressor. It is a small, 1/4-inch diameter port with a cap on it.
4. Remove the cap from the low pressure port.
5. Connect the charging hose from your air conditioning recharge kit to the low pressure port.