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dying cow moaning sound from accumulator/dryer update

joeynenj on Sat June 14, 2008 9:18 AM User is offline

Year: 2001
Engine Size: 2.5
Refrigerant Type: 134a
Ambient Temp: 75
Pressure Low: 25
Pressure High: unknown
Country of Origin: United States

hi, i recently posted "last summer i was foolish enough to try and add some r134a to my system using a refill can and supplied cheap guage, i charged it to the "normal" level on the guage. The system cooled fine but everytime the compressor would cycle off, the accumulator/dryer i think its called would have this sound like a dying cow MOANNNN for about 2-3 seconds and i could feel it thru the gas and brake pedals as it vibrated. My neighbor a subaru mechanic said i overcharged the system and that i probably didn't do any damage "yet". Winter came and thru spring it was quiet and worked fine for defrost and days it was around 75-80F. The other day it was 102 F outside, AC ran fine and was cold but again the MOANNing started as the compressor cycled off everytime. I checked the pressures with the engine at 80F and the interior at maybee 120F with AC running on high on recirc and was getting about 25 psi on the low side, as the engine got hotter and the interior got cooler maybe 75-80F and the compressor started to cycle, the noise started again and the low side pressure dropped to about 27psi. Today it was about 80 F,and the AC worked great with no noises but i fear the next 85-100 deg day.
a friend of mine with the same car/same ambient temp suggested i test the static pressure and running low side pressure, both of us were at 75 deg F, he got reading of 25 low and 60 static and i got readings of 38 low and 70 static, so im guessing my pressures were a bit high, does this make sense to anyone in reference to the moaning noise i mentioned above? I readjusted to 25 lowside at 75F and will wait for the next 85-100 deg day to see if the noise returns...

Any help greatly appreciated,Thanx , Joey
[email protected]

Chick on Sat June 14, 2008 6:19 PM User is offlineView users profile

How did you 'adjust" the pressures?? The pressures depend on the outside temp (Underhood also), and will rise with the temps.. Air in the system will also affect pressures while running, If I were you, I would have the system recovered and properly recharged to system spec, you risk ruining your compressor if running it with a low charge..

Email: Chick


Freedoms just another word for nothing left to lose

joeynenj on Sun June 15, 2008 9:09 AM User is offline

joeynenj on Sun June 15, 2008 9:11 AM User is offline

I adjusted the pressure by using some kind of machine a family member has that does HVAC work, i dont know what it is, and yes i know the ambient and underhood temps affect pressures, when i measured against my friends car we were at the same ambient and engine temp, Thanks

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