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89 suburban w/dual AC retrofit

Drake57 on Fri August 31, 2007 10:57 AM User is offline

Year: 1989
Make: Chevy
Model: Suburban w dual AC
Engine Size: 5.7
Country of Origin: United States

When I replaced the compressor 8 years ago the shop I took it to charged it with Freeze 12 - It would cool as long as it was moving, but stopped in traffic it was lousy. At the time, the shop told me that R134A would not work well in a dual air system.

Now my compressor has locked up again. My thought is to replace stock fin and tube condenser with largest PF that will fit, and use R134A.

Should this combination cool decently?

Also, is there a different orifice tube for R134A vs R12? IIRC the orifice tubes are color coded with respect to the intended refrigerant, but please correct me if this is a misconception.

PS are the new R4s from AMA worth the price difference vs the reman'd R4s?

Lastly, what are suggested oil and refrigerant capacities for said system with R134A?

Thanks so much for all the valuable assistance given by AAC forum!

TRB on Fri August 31, 2007 1:43 PM User is offlineView users profile

My opinion is to stay with R12 and only use a new R4 compressor. Suburban has a lot of space to cool and even with a true PF condenser I prefer R12 in these systems.


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mk378 on Fri August 31, 2007 5:39 PM User is offline

Freeze-12 is a R134a based substitute. There's no reason to use it compared to chaging the oil and using pure R134a. Clearly real R12 works best in these.

Orifice tubes are color coded by size. Some recommend going down a size when switching to R134a to compensate for the higher condenser pressure experienced with that refrigerant.

The fan clutch is critical for best performance when sitting still. Use a heavy duty actual GM one. Don't use the cheap generic ones from discount parts stores. Old worn out fan clutches still appear to be working, but they don't spin the fan fast enough.

chris142 on Sat September 01, 2007 12:07 AM User is offline

This is one of the cars that need to stay R12. I have tried everything from O-tubes to condensors and they just won't work well with R134a.

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