Can get advice on how to detect a freon leak and to recharge properly afterwards?

Hi,

Last year I replaced my compressor and the A/C worked fine for 2 months.

Then it started to not blow cold air anymore and I added some Freon, and it blew cold again but only for a few days.

I most likely have a leak.

I’m looking for the best possible way to detect the leak without costing me so expensive.

I suspect it may be the condenser is the issue but I’m not sure as no real test was performed.

Could I have some advice to detect the leak and to recharge properly afterwards? Of course if any repairs are required it will be done prior to the recharge.



Thank you