Ac problem

Its blowing out the back because thr pressure is too high. Did you replace the condensor at the same time? Did you have the system vacced and recharged? Orrrr Did you simply replace the compressor and try to charge it yourself....

I'm guilty of the last.... shame on me.

 

Does the fan cycle on and off?

 

Your fan should cycle on and off with head pressure. Could be bad high pressure switch,fan switch.

 

Make sure you hooked the lines to the right ports on the compressor. Not trying to be funny,I've seen it happen

 

The blockage is in the condensor. When your compressor failed it plugged the condensor. Change it. Flush the lines. Vac and charge.