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?

 

The valve isn't too expensive. I would just get the OEM valve. I believe it's 95557310000. I've replaced one before, and I don't recall any trouble obtaining the part. If you have access to an A/C machine, it's not going to be hard to do by yourself. If not, I would go with an indie. A dealer will likely charge at least an hour; an indie may be more flexible. It takes 30-45 minutes, but most of that is the machine doing the evac/recharge.

 

do you know if the 05 CTT calls for a unique a/c compressor, which differs from the 05 CS version of the car?
A shop told me that there is a different version of compressor for the 3.2, the 4.5 and the 4.5turbo. A dealer told me there is only the 3.2L and the 4.5L version, with the 4.5L version fitting any of the submodels of the cayenne.

Can someone help clarify this for me?

 

There are only two compressors - One for the 3.2 and one for the 4.5/4.5 Turbo.

 

Great to hear (and good catch on my fat fingers...lol).
So the shop is blowing some smoke up my ****?

 

Either that or they just don't know what they're talking about.