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AC compressor override ON switch location + AC PD

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Does the cayenne have a switch somewhere that will automatically turn on the ac compressor when the line pressure is low?
I just discovered that my hi pressure port was leaking.
Background story:
AC stopped working (started blowing warm air only no matter what settings I had), so I popped off the cover and undid the cap. Then as I stand there, hears a small hiss coming out of the hi pressure port connector. Tried to see if it can be reseated but nothing works. Connected ac gauges and read about 120psi on high side. The low side read about 120 PSI or so as well (to my knowledge with AC off both sides equalize so you can have a reading like that on low side).
Soooo, trying to decide if I should do this myself or drop off at mechanic. My choices are:
1. DIY (buy hi port connector, replace, pull vacuum, repressurize)
2. Drop off at dealer - will they charge a lot to do vacuum pull + recharge + replace of connector?
3. Drop off at indie shop to do same.
How hard is the part to get. Autozone/Adv Au/prts do not have this and looks different from their connections anyway. Seems dealer part.
Have the gauges and can get the evacuator no problem, but wonder about the connector availability. Repressurizing is a breeze as I have the charts for ambient temp + Hi & Lo side mins/Max values.
Should I give it a crack or take to deal/indie due to low charges for this?
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There was another thread on the compressor where some said our didn't have a clutch although my '06CTTS has a clutch on the OEM Denso compressor with the standard single power wire to engage/disengage it. You either have to jump the low pressure switch or power the clutch to get the compressor to spin with low pressure. The factory actually pulls a vacuum in the whole system with the engine off and fills directly with liquid (not gaseous) freon. If it was just a slight leak and never drained then you could easily top off with gas. But with 120 psi in the system it should be enough pressure that the low pressure switch shouldn't cut out.

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do you know if there is a special a/c compressor for the 4.5 Turbo engine, then another for the non turbo 4.5, and another for the 3.8L version?

A shop told me there is a turbo version of the compressor, but dealer told me there is only the 3.8L and 4.5L versions, with the 4.5L version fitting any of the models of the cayenne.

Would love to know real answer for this.

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