I dont believe it is the clutch, and if it is the clutch it does not sound right lol.

When I turn off the AC it makes a clunk, and just like the previous poster said, it sounds like pressure is being released - not like a clunk and pressure release that normally happens, but very loud.

Since the compressor is only a year old, I would hope that it is not on its way out - of course could be a defective compressor.

Do any of these options sound like they could be causing the problem?

1. Low oil

2. Too much freeon - overcharged (low side is showing 35 psi, dont have anything right now to measure high side).

3. Loose or streched belt

Thanks!

Don't forget:

4. too much oil
5. wrong oil used after conversion to 134a.

If you added PAG oil and your system contains any rubber parts that were previously running R12, it is likely contaminated with chlorine.

But first check for too much refrigerant (Suva, not Freon). You will need a high-side gauge for this. And that new high-side gauge will also come with a much better low-side gauge than you have.

The low side pressure doesn't tell you much about the refrigerant quantity because you have a variable-displacement compressor.