04 Cayenne a/c problem

[ricurt]

On this Cayenne I just acquired  the latest problem I discovered is the a/c is not blowing cold. Checked the compressor and discovered the yellow-violet wire to the plug was cut and crudely taped off, the other red/blue wire was spliced then hooked to the plug at the compressor and has 13 volts to it all the time the cars on. Also I noted the clutch on the compressor is always engaged with the plug hooked up or disconnected and a/c on or off ? there is gas pressure in the system. Question is the clutch or compressor bad and why is there two wires one hot one not going to the compressor? The wire schematic shows one constant hot wire from the fuse and one going to the climate control? wonder how that works? Oh I hooked back up the cut wire with no change resulting. Thanks for any help! 

Edited June 1, 2017 by ricurt

[Gonzales]

My ac just stopped working today. If I find sth. let you know.

Wysłane z mojego D6503 przy użyciu Tapatalka

[ricurt]

Thanks! Trying not to have to take it to the dealer which is quite a ways away.

[lewisweller]

16 hours ago, ricurt said:

On this Cayenne I just acquired  the latest problem I discovered is the a/c is not blowing cold. Checked the compressor and discovered the yellow-violet wire to the plug was cut and crudely taped off, the other red/blue wire was spliced then hooked to the plug at the compressor and has 13 volts to it all the time the cars on. Also I noted the clutch on the compressor is always engaged with the plug hooked up or disconnected and a/c on or off ? there is gas pressure in the system. Question is the clutch or compressor bad and why is there two wires one hot one not going to the compressor? The wire schematic shows one constant hot wire from the fuse and one going to the climate control? wonder how that works? Oh I hooked back up the cut wire with no change resulting. Thanks for any help! 

Couple of things pop to mind, either the wire was broken and they put in another, or this is a work around for a non functioning climate control compressor on signal or to keep the AC compressor activated even when the engine load is high and the Ecu would normally switch the compressor off briefly to boost power output availability. 

 

[ricurt]

 The thing is the wire from the climate control was not hooked up. It was left cut. Your right though someone found the compressor clutch stuck on and was trying to stop it, when they saw that cutting the wire didn't shut it off taped it off and left it not wanting to replace the compressor.

[Brett968]

ricurt, The compressor doesn't have a clutch. The wires that you found are for the compressor control valve. Read my reply in this thread:

 

Brett