06 Porsche Cayenne, No A/C, HELP

[Scott McKinney]

I have a 2006 Porsche Cayenne S, and my A/C is intermittently working. Everything works fine on the dash, just does not blows cold all the time.

I have scanned for codes with my Durametric, and the only code in the A/C is: 1299 Implausible Gateway signal. I have cleared the codes, but it immediately comes back.

Upon looking at actual values, engine shows A/C Compressor OFF & Refrigerant Pressure shows 192. I have replaced the A/C compressor with brand new, no change.

What else do I need to check to diagnose this issue properly? Any help would be greatly appreciated. Please advise.

[Scott McKinney]

Readings from Durametric tool. Upon looking at actual values, engine shows A/C Compressor OFF & Refrigerant Pressure shows 192 & 7-10 bar. At certain times, the A/C Compressor will show ON and A/C blows great. I have replaced the A/C compressor with brand new, no change. At times, the Air Quality sensor value says 0 and others it says 1. At one point, I was pretty sure once it said 1, the A/C started blowing cold, but cannot confirm that for sure, usually always says 0.

What else do I need to check to diagnose this issue properly? It appears something is causing the A/C compressor to command OFF instead of ON, just not sure why.

[Ahsai]

I'm not familiar with Cayenne at all but your evap sensor readings are all around -3~+5C, which can't be true if the a/c is not operating. I wonder if the sensor is reading low temp falsely and that prevents the a/c from turning on...because the evap temp is detected as very low (when in reality it's not).

[Ahsai]

Perhaps you can read the sensors again first thing in the morning and see if the evap still measures ~0C? You would expect it to read ambient temp...

[eshaze]

Bump, Scott did you ever get this issue resolved?  I'm having the exact same issue.

 

Thanks

Sam

[robischult]

How do you think the price for courting the aircorn system would be?

Edited October 28, 2021 by robischult

[JFP in PA]

Welcome to RennTech 

I'm not really sure what you are asking, could you provide more detail?

[robischult]

Uhh, having a car like that and having no needle is tight. Especially when it's really hot outside and you have to do something so that the tin in the car is cool. What I can advise you is not to rush to change the entire air conditioning system. He's very expensive and I don't think he has ros. I did such a stupid thing. You will initially have to unfasten and clean it, only then you will understand what your problem really is. And if you still want to change some piece, you are advised to go on https://www.socool.sg/pricing/. here are also suitable prices, but also good quality