You may not have enough freon. Make sure that the compressor is engaging if is engaging adding Freon may do the trick . Most AC's when low the AC pump won't engage. You can do this yourself I have.
Check blend door. will blow hot even though lines are cold
SOURCE: how much compressor oil do I add when changing the
When replacing the compressor the dryer should also be replaced, you put 2oz of oil in compressor and stand compressor on pulley for 5 min, then after install turn clutch 10 turns to pump most oil out of compressor, the dryer should have 2 oz of oil also, if you are flushing the ac system out with a solvent then more oil is needed for the system, if your just replacing the compressor then 2oz in compressor.
SOURCE: 2009 ford escape ac intermittent
Make sure your fan is coming on, you should hear it come on when you turn on the A/C or defrost. The most common problem for that symptom is the fan relay burns out, and the A/C comes on strong but then overheats quickly making the pressure in the condenser get too high and the pressure cycling switch automatically turns off the A/C. The condenser then cools and the process starts over. If you can locate your radiator fan fuse and relay, which will be in the fuse box under the hood, you can rule out the relay by pulling one of the same size from another system that isn't important like the fog lamps(if equipped). As long as you verify that the fan is NOT working, you would try this relay swap test as long as the fuse is still good. I work for a Ford dealer as a technician, if you brought your vehicle in for service for an A/C or heater concern and your still having problems with it. You can bring it back in for a "recheck" or "repeat" repair and they will have no right to charge you again... If I worked on someones car, and the problem came back after they left, I would seriously want to know because I care about my work and care about my name as a master technician. Just remember, you do not have to pay for repeat repairs... EVER!!
I hope this info helps!~subyguru~
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