Automotive Air Conditioning Information Forum (Archives)

abbouddi on Tue March 27, 2012 2:25 AM

Year: 2007
Make: Mazda
Model: 6
Engine Size: 2000
Refrigerant Type: R134a
Ambient Temp: 95
Pressure Low: 25
Pressure High: 200
Country of Origin: Saudi Arabia

Morning when ambient temperature is not yet high (77) and the car is still cold, I started the AC, and I dont hear any noise, it is really quiet as there is no problem
At noon, when the temperature raise to 95 and the car becomes hot, I start hearing abnormal noise from compressor. then next day morning, no noise
What are the reasons behind this? I have doubt that the lubrication oil in my system is more or less than required. How to confirm this?
Is it because of oil? refrigerant? or damaged compressor?
By the way, AC is well cooling in both cases (with and without noise)

Edited: Tue March 27, 2012 at 2:28 AM by abbouddi

mk378 on Tue March 27, 2012 10:19 PM

Pressure rises when hot, putting more stress on the compressor. Noise from inside the compressor at 200 psi is not good. (when there is a problem with the fans for example, letting the pressure rise to 450, even a good compressor might make noise). If the belt is loose, it may start to squeal under the strain of high pressure but be quiet otherwise.

HECAT on Fri March 30, 2012 7:21 AM

Quote
Originally posted by: abbouddi
I have doubt that the lubrication oil in my system is more or less than required. How to confirm this?

The only way is to remove all the oil and know how much you put back in.



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