Car: x'06 2.2 EX FK3 Milano
Join Date: 29th April 2014
Thanked 4,156 Times in 3,852 Posts
Are the o-rings you bought, specifically for AC systems?
Before you disconnect the condensor you should ensure the system has been safely depressurised, it's illegal to deliberately vent to the atmosphere. There are enough AC systems leaking of their own accord, without adding to the environmental time bomb.