Automotive Air Conditioning Information Forum (Archives)

trail rated on Wed August 07, 2013 9:07 PM

Year: 2006
Make: Saturn
Model: Ion
Engine Size: 2.2L
Refrigerant Type: R-134a
Ambient Temp: 35C
Pressure Low: 4Bar

Hello, a humming noise seems to be coming from the air con compressor and I am wondering if this is something I should be worried about. This sound is only apparent when it is warm outside but it becomes louder with an increase in outside temperature and fan speed. It seems to be related to compressor load because the sound is not as loud when the fan is on the lowest setting and the system is set to recirculate. The condenser fan works and there is good air flow through the condenser. I checked the low side pressure and it was approaching 4 Bar with the fan on the highest setting and the system set to outside air. On recirc and the lowest fan speed the pressure was only 2 Bar. Compressor discharge temperature was 85C and liquid line temperature was 60C on outside air and high fan speed. It cools well and the only problem is the noise. I was thinking there may be a restriction in the condenser but I would like to hear more ideas. Youtube Video

Edited: Wed August 07, 2013 at 9:21 PM by trail rated

TRB on Thu August 08, 2013 1:09 PM

I could not hear any sound in the think. But many Sanden's have a rumble in that range.

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trail rated on Thu August 08, 2013 9:05 PM

Ok. I remember the compressor always made a quite rumble or humm sound in that RPM area when the weather was hot, but the sound just seems to be much worse now. Also, I noticed the low pressure schrader valve was leaking slightely but it seems to have stopped. I think the noise may be caused by low refrigerant, so I will replace the valve, vac, and weight in 400g of refrigerant. Hopefully the compressor will become quieter.

TRB on Thu August 08, 2013 11:32 PM

Sounds like a plan.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

trail rated on Sat August 10, 2013 10:30 PM

The compressor is now much quieter with the correct refrigerant charge.