No A/C, driving me crazy.

clandr1 · 2026-07-26T00:30:40-0400

OR VietVet said:
If you say so.

It’s the truth :shrug:

mikez71 · 2026-07-26T00:40:08-0400

clandr1 said:
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?

No A/C, driving me crazy.

clandr1

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mikez71

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