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Message: [QUOTE="Lethalthreat7.3, post: 743346, member: 10651"] Zilla68 is correct saying you have probably overfilled the oil charge but that's not causing the charging issue.the oil does two things, lubricates the compressor and insulates the interior of the refrigerant components by coating the interior surfaces and is carried throughout the system is very small amounts as the refrigerant travels. I would look for a blockage in your hoses, gauges or Schrader valves, i have seen dozens of times where upon tightening down connections the o-ring/d-ring is worn and it is forced out of the groove blocking the port. You need to account for the charge in the hoses as well, approx 3oz for a 48" hose. At this point i would try the following. Make sure no blockages as stated above. Using nitrogen completely clear out the condenser, evaporator and lines. Remove the accumulator and dump the oil out of it. ( there is a minimum amount of oil needed in the accumulator but you have that covered, empty it). Make sure the orifice tube is clean with no wax or debris buildup. Remove compressor and empty all the oil from it as well. Refer to the specs once you have it emptied to refill it with NEW OIL. PAG is very hydroscopic so don't reuse it and try to get the system sealed up as quickly as possible.( Never use an old can of PAG, it will absorb atmospheric moisture.) Put the vacuum pump on it for a couple of hours if possible. When testing if you want at least 500 microns. With just gauges you want to shut the gauges off and let it sit for 15-20 minutes and if the needle moves AT ALL you either have a leak or moisture. With the system in a good vacuum, hook up your refrigerant. It is critical not to allow non-condensibles/air into the system, especially with R-134a. Make sure the line is bled between the bottle and the manifold. Slowly send the charge to the compressor on the suction side. You should weigh it adding the extra oz's for the hoses. A lot of heat is produced with r-134a so put a large fan in front of the condenser on high to simulate 35mph running down the road. This airflow is needed to disappate the condensing heat. Should work for you. [/QUOTE]