I had the same issue with an 87 Toyota Truck. One way to test the dirty condenser theory is to leave it idleing at home and put a box fan blowing through the grill. If it cools off it could be one of two things. Either the condenser is dirty or the fan clutch Is week. Too test the fan clutch try stopping the fan with your hand when the motor is at normal running temp. The blades are plastic and will not hurt you. If you can stop the fan by hand your fan clutch is bad and not pulling enough air through the condenser when stopped this will cause the head pressure to rise and your AC will stop cooling.
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