No A/C, driving me crazy.

[clandr1]

If you say so.

It’s the truth

 

[mikez71]

Yes, but if the PCM is getting a reading it doesn’t like re: high pressure, TPS, engine coolant temp, ambient temp,Or engine idle, jumping the low pressure switch connector won’t make the clutch engage.

Right, it looks like the PCM controls +B to the compressor.

Have you tried a new A/C relay yet?
Since it sounds like the shop confirmed PCM is sending the right signal, and jumping the relay also works.
Perhaps when the shop commanded the clutch on with a scanner and it worked, it was a short period of time before the relay could act up?