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Old 08-28-2015, 11:23 AM   #1
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Air Conditioner

The a/c in our motorhome does not work. It was R-12 and we now need R-134. I found a new air compressor at O'Reilly's. Does anyone know if I used the correct info. I told them I have a 1979 Airstream Excella Motorhome built on a Chevy P-30 chassis with a 454 engine. Do I need any other info? I don't want to order it and then get stuck paying a restocking fee because it's not the correct one.
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Old 08-28-2015, 11:26 AM   #2
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I'm not an expert but I believe there's more to the changeover than just the compressor. I think the receiver/dryer also needs to be changed, and probably some other components as well.
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Old 08-28-2015, 11:43 AM   #3
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Usually also requires an orifice change


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Old 09-03-2015, 01:24 PM   #4
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Might be less expensive to scrounge some R-12 for cash off Craigslist.
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Old 09-03-2015, 02:03 PM   #5
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I changed the compressor/drier on my 1987 Mercedes and just put R134A in with no other modifications. It had been cooling for 7 years.

With that said, later I found another refridgerant called Envirosafe. It is marketed as a R12 and R134A replacement. I currently have it in two vehicles. It works very well.
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Old 09-03-2015, 03:17 PM   #6
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Are you sure it is the compressor? Did you check the compressor start up capacitor? I just fixed my air conditioner and started with the capacitors. They were both fine. My air conditioner was not working and I discovered it was the motor. If the motor works and you click from fan to air conditioner and nothing happens I would check the capacitor first. when you take off the cover you will see a little door closed by a sheet metal screw. You will see two capacitors side by side. The one that has a red, white and yellow wire is your Compressor capacitor. Get the information off of it and go to a AC company and have them check it. They will sell you one for under 10 dollars

The air won't work unless you are on a 30 amp outlet
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Old 09-03-2015, 04:08 PM   #7
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I believe the OP is talking about his automobile AC.
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