If your system is not functioning correctly it is probably due to the compressor not working because of low gas pressure ( they have a safety feature which stops them running) . Never tried the DIY kits,have heard many bad reports which ended up with people having to go to a garage to get the job done properly! I used a guy recently to recharge my system in a jeep,was very good,he is based in Tallaght but will call at your workplace/home,cost me €70,very well worth it especially over the last few days!! His name is John. 0872559706. Hope this helps