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Compressor Noise after adding 134A

trammd on Sun June 15, 2008 10:38 AM User is offline

Year: 2006
Make: Chevrolet
Model: HHR
Engine Size: 2.4
Refrigerant Type: 134A
Country of Origin: United States

Hi, I just purchased this vehicle(2006 Chev HHR 2.4 4 cyl) and I noticed the AC wasn't cycling (clutch engaging) when turned on.
I summized it was probably because of a low 134A charge. I added about 9-10 oz of 134A and the compressor began to cycle normaly and blow cold. ( I used a store bought kit with guage to prevent overcharging)

It worked great all day but at the end of the day the compressor began to make noise. (clutch is quiet) Noise is only when compresor is working. Do you think this is because I am low on oil? I noted that the vehicle takes PAG oil but I am not sure how much or what viscosity to Add? The system is sealed so I was hoping to add some oil to the low side port to quite down the compressor.
Am I on the right track here? I turned off the compressor immediatly upon hearing the noise.
Thanks for any and all suggesstions!

Big3 on Sun June 15, 2008 12:54 PM User is offline

Big3 on Sun June 15, 2008 12:56 PM User is offline

trammd on Sun June 15, 2008 3:52 PM User is offline

Any suggestions from a Knowledgable Person in the forumn? Happy Fathers Day!

bohica2xo on Sun June 15, 2008 6:42 PM User is offline

If the system was not working at all initally, it was nearly empty. Your first step should have been to locate the leak.

It is not possible to do an adequate diagnosis without both high & low pressure readings. You may be simply overcharged, or running dry. No way to tell. You need a manifold set with both gauges.

My recomendation is to go back to square one with a used car & no A/C. Evacuate the system, pull the TXV & have a look for debris. The factory installed UV dye in that system when new, so locating the leak should be done with a UV lamp. Of course if some used car dealer steam cleaned the oil leak away...

Pull the discharge line at the compressor & look for debris. If the line is clean inside, then all you need to do is flush out the remaining oil in the system & start over once you locate & repair the leak.



B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

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