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New to me car advice

onefast66nova on Sun September 21, 2014 3:50 PM User is offlineView users profile

Year: 1978
Make: chevy
Model: malibu wagon
Engine Size: 305
Refrigerant Type: r-12

i just bought a clean 78 Malibu station wagon. The car has been sitting for about 8 years. Before it was parked the previous owner spent about 600 bucks on the ac system including new a6 compressor, receiver dryer, and pressure switch. The system was never finished and charged and compressor has not ran in 8 years. I tried to spin it over by hand and the compressor will not spin. The pulley free spins just fine. The system has been sealed this whole time. I am looking for some professional advice. I plan on pulling compressor off and draining all oul out and trying to free it by spinning and dumping fresh oil in. Also I plan on flushing out evap and condencer to change o rings and to r134. And tips or guidance would be great. Thanks in advance. Bill

Edited: Sun September 21, 2014 at 3:52 PM by onefast66nova

Olds442 on Mon September 22, 2014 2:29 AM User is offline

There's no reason to change to 134. You'll just be setting yourself up for extra work and expense unnecessarily. Can you get somebody to work with you who has done A/C work before ?

onefast66nova on Mon September 22, 2014 7:35 AM User is offlineView users profile

Yes I work at a shop that does normal ac work just not up on the whole retro fit stuff. My main worry is the seized compressor from sitting. I get 134 for free is why I was gonna convert. That and r12 is hard to find in our area.

mk378 on Mon September 22, 2014 5:18 PM User is offline

You are on the right track to pull the compressor off and try to unstick it. Note that the A6 has an oil drain / fill plug in the side.

If you're going to use R-12 you should do a full flush in case someone in the past converted it and installed PAG oil. PAG oil is not chemically compatible with R-12. When using 134a use POE oil instead of PAG, this will make it much simpler to revert to R-12 if desired.

bohica2xo on Wed September 24, 2014 11:57 PM User is offline

How are you trying to spin the compressor?

New or freshly rebuilt A6's can have a bit of friction.

Any records on what was done 8 years ago?


"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.

onefast66nova on Thu September 25, 2014 4:35 PM User is offlineView users profile

Last night I put a socket on a ratchet on the center shaft of compressor and it turned over with little effort. It was just more effort needed that I could do by just grabbing clutch. So in may of 2005 there was a reman a6, accumulator, orifice tube, and thermo-cycling switch. At that time it was charged with r-12. The car than sat for the next year and 9/06 a new compressor was added but the system never charged. Unsure why the compressor when out or the charge was lost but the system has been sitting sealed but uncharged since 9/06. Plan or flushing everything minus accumulator and compressor and draining sump oil from compressor and flushing new oil through compressor then charging the system with 134.

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