This product solves one main problem(symptom), low freon.
The issue with this is that most cases of a car that have low freon is caused by a leak somewhere in the system.
If your car suddenly stopped blowing cold air, then this will most likely not fix your problem.
Your problem is probably one of two things:
- A/C Compressor died
- Large freon leak
I did a quick google and there appears to be A/C stop leak, but I do not know the efficacy of it, so YMMV. But, again, if you lost cold air quickly then this type of product most likely will not help you out.
From personal experience when the A/C stops working it is very often the compressor. There just isn't much else in the A/C system that is likely to break.