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Old 08-21-2019, 06:11 PM   #1
sumofish
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Drives: 2009 4door GTI
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AC not working

My AC seems to be blowing hot air.

I check both fans are working, I can hear a humming noise coming from the engine when the AC is on and it goes away when I turn it off. Also there seems to be a small squeaking noise when the AC is on.

Is the AC compressor not working anymore?
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Old 08-23-2019, 01:30 PM   #2
iKhmaiFoSho
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Quote:
Originally Posted by sumofish View Post
My AC seems to be blowing hot air.

I check both fans are working, I can hear a humming noise coming from the engine when the AC is on and it goes away when I turn it off. Also there seems to be a small squeaking noise when the AC is on.

Is the AC compressor not working anymore?
I've had this issue so I plugged in a vag com to monitor the refrigerant pressure and state of the a/c. I notice I was high on a/c refrigerant and the a/c was turning off and on, so I "safely" purged out some refrigerant to keep it below the threshold and bingo. I believe this is a safety feature so we don't over pressure the a/c compressor and damage it, pretty cool. Try this first.

If all checks out and you are below the refrigerant then maybe it can be the compressor.
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Old 08-24-2019, 05:29 PM   #3
sumofish
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Originally Posted by iKhmaiFoSho View Post
I've had this issue so I plugged in a vag com to monitor the refrigerant pressure and state of the a/c. I notice I was high on a/c refrigerant and the a/c was turning off and on, so I "safely" purged out some refrigerant to keep it below the threshold and bingo. I believe this is a safety feature so we don't over pressure the a/c compressor and damage it, pretty cool. Try this first.

If all checks out and you are below the refrigerant then maybe it can be the compressor.
How do I "safely" purge out some of the refrigerant?
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Old 08-25-2019, 04:02 AM   #4
vwengineer
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Originally Posted by sumofish View Post
How do I "safely" purge out some of the refrigerant?
You don't, go to a shop, get the system evacuated and refilled with the correct amount of refrigerant. That would be step one, step two would be to replace the actuator on the A/C compressor that is prone to failure.
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Old 08-25-2019, 06:28 PM   #5
sumofish
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Originally Posted by vwengineer View Post
You don't, go to a shop, get the system evacuated and refilled with the correct amount of refrigerant. That would be step one, step two would be to replace the actuator on the A/C compressor that is prone to failure.
Is it hard to replace the actuator?
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Old 08-26-2019, 02:33 AM   #6
vwengineer
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It's not so hard but you have to evacuate the system
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