03 e53 AC problems

[jimdanforth]

Originally Posted by 80stech

When you say there is no voltage at the compressor clutch, have you measured or are you assuming there is no voltage because the clutch doesn't cut in ? Have you tried revving the engine to get the compressor compressing ?

I measured it. Pierced the wire and took voltage. It does come up when the INPA turns it on, but not when I request it from the temp selector.
Yes, I did rev the engine to near redline with INPA turning on the compressor, and still no delta on the gauges. Tried without INPA just to cover all options and it still not not engage or change pressure.