First, 1500 rpm is to high to do any pressure testing while sitting in the garage or in the driveway. 1000 rpm is high enough to tell if the fan is pulling anything. driving down the road puts lots of air through a condenser. The best way to check high, high side pressure is with a garden hose. 134a will come right down to about 200 psi quickly if the system can work.
At 300,000 miles you need to replace the whole system except the evaporator. If you pull the orifice tube it likely will be almost plugged. Now, to dispel the kitchen legend about the desiccant being what plugs the orifice, it isn't the culprit. Crap coming out of the compressor piston rings is. The desiccant won't get to the orfice through a modern condenser, the holes are just to small. The desiccant would have to leave the accumulator, get to and through the compressor and get through the condenser to arrive at the orifice tube. Won't happen. Systems that use a dryer instead of an accumulator don't use an orifice tube. They use expansion valves and the expansion valve is the next thing downstream from the dryer and will plug off from the desiccant and one good size grain will do the damage.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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