AC conversion help...

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Jun 15, 2009
I know, I have searched the forum for insight and there is quite a bit but here goes... I have a 1992 with all the original components (drier, expansion valve and compressor) with R12. Does it make sense to replace all items if I am converting to R134? I have not had AC for ther past 2 years (just didn't deal with it) and now I am ready to do the conversion. Any insight is much appreciated!
Would help to know why you don't now have A/C... Did the R-12 leak out, faulty component, etc. If you had/have a leak, you'll want to repair that before either refilling with R-12 or doing a conversion.
Compressor cycles on and then I get some squeeling. I need to put the gauges on it to get a high/low side reading. I have added R12 but it still does not blow cold. I was thinking that it may make sense to get new components...
Check the condition/tension of the belts first. Is the sight-glass clear when the A/C is running? If you can post the gauge readings, that will help immensely.
From what I have heard a R-12 system will not run as cold with R-134 as a rig with R-134 from the factory(unless you replace the r12 components). I would stick with R-12 and either find a shop that still carries R-12 or try that freeze 12 stuff. Freeze-12 Refrigerant R12 AC Replacement 12oz. Cans: Automotive

I love the R-12 in our old volvo literally as cold as ice.
Finally got the gauges on and the readings were around 375 and 45. Compressor is workinig fine but I was told that the expansion valve is clogged due to the desiccant bag deteriorating and clogging things up.
My question is does is make sense to evacuate the system and replace the valve and drier, anything else I should do?
375/45 is really high. Are you sure you don't have too much refrigerant in the system?
There may be too much refrigerant and the tech mentioned this but we were not getting any change in the temp at the expansion valve, not sure if that makes sense...
If the expansion valve was plugged, the system would go into vacuum on the low side. If the expansion was wide open, typically the high and low side pressures would be fairly close. Like Scamper said, this looks like an overcharge problem.
Should I notice a change in temp around the expansion valve? Should that area feel cold when the air is on?
If the system is operating correctly, you should see maybe 5 degrees difference from the evaporator inlet to outlet. The suction side would normally be cold. With the pressures that you have, I'd recover the refrigerant and see how much was in the system, then pull a vacuum on it and charge it with the correct amount of R12, which should be 2 lbs.
Roger that... I am planning on doing just that this weekend. I appreciate the feedback. I will post back with results...

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