Posted by jimg.allentown on July 27, 2015 at 15:42:59 from (173.49.143.208):
In Reply to: Pickup AC Repair posted by dhermesc on July 27, 2015 at 08:22:17:
OK, I'll add my two cents here.... Replacing the condenser is not a difficult job. Recharging the system is best left to the professionals. Yes, you can buy those recharging kits at most auto parts stores, but the success rate with them is low. Mostly because of untrained and inexperienced folks simply do not understand refrigeration, and have some mistaken ideas about how to repair a non-working A/C system. There is a reason for evacuating a system and replacing the receiver/dryer before recharge. The receiver/dryer acts as a filter for the dirt in the system, and absorbs moisture to keep it out of the wrong places. It also holds excess refrigerant and oil. I would suggest that at the minimum, you get a set of gauges and a vacuum pump. It is money well spent.
As to oil: First thing to know is that the oil circulates with the refrigerant. R-12 uses a mineral oil that will not circulate with R-134a. As such, you do need to replace the oil in the system with an ester oil. Ester oil will circulate with the R-134a, and will not react badly with the mineral oil that will inevitably be left in the system. Not advised to use PAG oil, as it will potentially react with the mineral oil. Evacuating the system is necessary for two reasons: 1) To remove the air from the system. Why? Because air is a non-compressible gas in this application, and air in the system can prevent cooling. In order to cool, the refrigerant has to be compressed to a liquid and then metered into the evaporator and evaporated in order to cool. Air will not liquefy at the pressures found in A/C systems. 2) To remove as much moisture as possible. Moisture in the system can cause corrosion and compressor failure. It can also cause icing if it gets into the metering device. Contrary to another post, you do not have to replace everything in the system or flush everything with solvent. Replacing the receiver tank and condenser in your case should be sufficient. Add to that evacuating the system and adding some oil. I have converted many systems to R-134a over the last 25 years or so, and never had to get too extreme with any of them. They all worked as long as they needed to.
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