Get a professional Manifold Gauge Set as mentioned by JohnHere and post both hi and low pressures, and ambient, and center vent temp (digital thermometer is best), with engine at 1500-1800, max fan, max cool, recirculate, doors and windows closed. With that info we can tell you the health of the sys...

Nonetheless, leak seal should be avoided, it is suicide.....marketing!!!!
All the pros here will advise against it

We NEVER advise leak sealant, see your other thread ...it will gum up your system

You did not step on any toes. We are here to help. We are in the USA so we limit most of our advice to EPA approved refrigerants, but as JohnHere stated you are still welcome to ask questions. On another note, we always advise owners to never use any kind of sealer, EVER. It is guaranteed to cause h...

I think the comp is NG, assuming it actually has refrigerant still inside

what is your country

I think any sniffer from a so-called big box store would do for the random user

You may be correct. The hi side pressure you give leans toward that. However, you have done the testing at 650RPM. We test auto AC by having the RPM at 1500-1800. Repeat your testing at that RPM. A compressor does very little work, if any, at such a low RPM Also, how many miles on the car? You are l...

Agree 100%

Are you saying 11.7 ohms for the compressor switch or the clutch coil?
I have never seen a clutch coil at more than 4 ohms, and 11.7 ohms for any switch seems high to me

"I have seen a lot of older systems that only have a trinary switch on the reciever dryer"

A trinary switch includes a LPCO:

"The AC trinary switch has three functions: high pressure protection, low-pressure protection, and fan control"

Try the automotive stores. Truth is, as you know, everyone is getting out of the 134 business, thanks to the EPA. EPA won't even let ppl sell refrigerant on eBay any more! These are stocks that were produced legally! Stock up when you can and be careful of how you vote! You need an administration th...