To do the job correctly, locate and fix any leaks first.

1. Recovery the old refrigerant (This will require a recovery machine).
2. Repair any leaks.
3. Evacuate the system (This will require a VACUUM PUMP).
4. Recharge the system to the specified weight of refrigerant required for your X. (This will require a manifold gauge set, and an accurate scale to weight the refrigerant).

If you want to do it on the cheap, see this guy post.

http://www.xoutpost.com/1037841-post21.html

Hope this help.

__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD