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I have a 2006 Porsche Cayenne S. My air conditioning has

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Hi. I have a 2006...
Hi. I have a 2006 Porsche Cayenne S. My air conditioning has intermittently been working since I purchased the vehicle but seemed to be getting worse and worse about blowing cold. It is a dual zone automatic climate control system. Sometimes I can get it to blow cold but constantly fooling with the settings, modes, and fan speeds but lately it is very hard. I am 99% sure that the A/C compressor is cycling because there is a change in pitch in the engine when I turn the temperature low, but still no cold air coming out of vents. I put 1.5 cans of freon in the system with a simple can & hose, but it will not accept any more, so I assume its full. Any common issues or things to try and fix this without an expensive trip to the dealer? I have access to A/C pressure gauges I can hook up and just purchased a Durametric scan tool. Any help on diagnosing my issue from beginning to end is greatly appreciated. Please advise.
Submitted: 1 year ago.Category: Porsche
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5/31/2016
Porsche Mechanic: FixItMan, Master Technician replied 1 year ago
FixItMan
FixItMan, Master Technician
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Satisfied Customers: 17,513
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Hello, my name is***** you tell me if both zones increase in temperature at the same time or will one stay colder than the other?
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Customer reply replied 1 year ago
It has dual zone controls (temperature control on each side), operation is erratic but mostly blows hot no matter what temperature either side is on. Please explain what you would like me try in detail and I will provide the outcome.
Porsche Mechanic: FixItMan, Master Technician replied 1 year ago

Do you have a pressure gauge set that will read the high and low side pressures?

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Porsche Mechanic: FixItMan, Master Technician replied 1 year ago

Thanks. Here is what I need. I need you to install the pressure gauges and start the vehicle. With the ac on please tell me what the readings are once they stabilize. Then continue to monitor it when the temperature begins to get warm. I need this to start as it tells me if the issue is in the basic ac system or in the interior electronics.

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Customer reply replied 1 year ago
Sounds good, I will have an update tomorrow morning, stand by
Porsche Mechanic: FixItMan, Master Technician replied 1 year ago

That is fine. I will look for your response tomorrow. Have a great night.

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Customer reply replied 1 year ago
The low pressure side fluctuates from 75psi to 100psi while engine is running
Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago
Lou P.
Lou P., ASE Certified Technician
Category: Porsche
Satisfied Customers: 5,079
Experience: I Have knowledge in almost all car lines and can help with general questions and more!!!!!
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Hello. Looking over your gauges you have no compressor activation or the system is too full. The low side should be 30psi and the high side should be about 300psi. The fact that they are equal tells me the compressor is not activating or the compressor is seized. You need to activate the compressor with the scan tool and see if the pressures change at all. That could be why it's not taking freon is because the compressor is not activating to suck in the freon. Let me know. Lou P

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Customer reply replied 1 year ago
I am 99% sure that the A/C compressor is engaging because there is a change in pitch in the engine when I turn the temperature low, but still no cold air coming out of vents. What should my next step be? Can I activate it with the Durametric Porsche tool?
Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago
you should activate it and watch the pressures to be sure. If the compressor is indeed kicking on something should change with the pressures.
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Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago
I understand what you mean by engine change but it could just be the change in preservation for the compressor activation.
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Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago
I meant preparation
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Customer reply replied 1 year ago
The low pressure side fluctuates from 75psi to 100psi
Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago
Ok 25 psi is nothing. So your compressor is a pulse width which means it's not a on off clutch style. Do you see the center bolt on the face of the compressor ?
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Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago
That bolt should be spinning with the compressor at all times. If the bolt is not then the compressor has seized.
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Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago

Any luck ? I have not heard back since my last post.

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Customer reply replied 1 year ago
I am awaiting on scan tool to arrive so I can verify A/C compressor is commanded on/run.
Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago

Gotcha. Another fast test would be to look at the center bolt I was telling you about. Put a socket on the bolt and see if it turns or not. Make sure you take the belt off first though. If the compressor is not seized then you will be able to rotate the pulley with the center bolt as well. If the compressor is seized the pulley will turn but the bolt will not.

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Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago

refrigerant pressure is too high was one code, erase the codes and see if it functions. it locks the compressor out if there are stored codes.

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Customer reply replied 1 year ago
Same codes keep coming back after clearing. What about the code for blower regulator, what is the problem there and what do I need to replace?
Porsche Mechanic: Lou P., ASE Certified Technician replied 1 year ago

ok you may have a failed pressure switch, you may want to replace it. also for the blower regulator, you would want to replace that as well. here is a pretty good write-up about it

http://www.pelicanparts.com/techarticles/Porsche-Cayenne/35-ELEC-HVAC_Blower_Fan_and_Regulator_Replacement/35-ELEC-HVAC_Blower_Fan_and_Regulator_Replacement.htm

let me know if this helps.,

Please take a second and click the stars at the top of the screen to rate me so i may receive my credit , 5 stars is ideal , please request me in the future.
Keep in mind then when you rate it does not end our conversation. you can still return here to me for follow up information if needed, Lou P.

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