AC clutch - no 12V, Fuses and relay ok

[FuelConsumer]

Hi all,
at first I thought the clutch itself is just old and worn out, but after checking the socket I measured no 12V there.
Going backwards: Wiring looks good, replaced all fuses and relay, as well as a new pressure switch today (I only found one on the passengers side next to the fan). There is enough refrigerant in the system!

I took the relay out and measured 12V there - this should go directly to the ac clutch, correct? If yes I might need to check the socket again.
According to rockauto´s parts list there is a clutch switch (basically the same pressure switch I installed today) but I can´t find it anywhere - it´s not near the ECU or the low-pressure line as some other people suggest.

Any ideas if there is more than this 1 pressure switch or why there are no 12v going to the clutch?

2007 Expedition with 435.000km.

 

[jkayca]

I have a 2017 and had AC issues. The compressor died and was replaced. It was good until a week later and I started to get intermittent AC. Sometimes it would work and sometimes it wouldn't. After some diagnosis, it was determined that the (pigtail?) connector and its wires were bad. The connector is right on the compressor. You could give it a nudge and the clutch would engage. A day of driving and AC would stop again.

Mechanic replaced the connector and wiring and now all is good. Constant AC. Not sure if this is your issue but my mechanic went through a lot of the things your are testing. Fuses, relays etc.