I looked in search, but did not see this particular problem. Have just bought another 1990 Bronco EB, 351W, full size. The previous owner said he had the a/c system "serviced" last summer,for the second time, but still had no cold air, for the second time. This system was converted to R-134 in 2004.The system was separated, the lines flushed, the condenser flushed and blown out. The evap. core was flushed and blown out. The accumulator was replaced. The cycling switch was replaced. A new orifice tube and filter was installed. The system was pulled to a vacuum (about 26"), and left to rest for about 45 min., and held a good vacuum. R-134 freon was being installed, but the system would only take about 1-1/2 cans or less. The low side reading was about 80-100#, and the high side was about 35-40#. Outside air temp when this was done was about 85 degrees, high humidity (rain on the horizon).The high side line (replaced w/ a line containing the R-134 port) just before entering the condenser is extremely hot to the touch (the gauge fitting is the same) (Hot enough to blister a finger!). The line out of the condenser going to the orifice filter and evap. core is luke warm. The air coming from the vent only gets cool when the engine is run at about 2000 rpm +, or driving down the road at 55-60 + mph. The vent temp is probably 10 degrees less than the outside air temp. The orifice filter that was taken from the vehicle was melted because someone tried to heat it to get it out, and broke it into a number of pieces (Don't know what was in/on that filter). When the system was disassembled for the second time, there was a lot of oil on the filter, but no particles or residue. The oil was blackish looking. The previous owner said that the tech added about 2 oz. of R-134 oil when it was "serviced". Could it be a compressor problem? Could the orifice filter be in backwards? I'm thinking that the filter screen end is supposed to be nearest to the evap. core (pointed downward in the orifice tube), right? Any ideas or suggestions are appreciated. Thanks.