03 Nissan Sentra AC problem, cant figure it out

Question

My 03 Sentra 2.5L has not had working AC for a few years now. We finally decided to try to fix.

We have replaced the compressor, the AC relay, the head unit, and recharged the system with no luck. The clutch does not engage. The blower works fine, the heat works fine, but the AC just wont work. Were thinking its an electrical prob, checked all the fuses, and have tested the wiring from the compressor to the AC relay, to the ECM with no problems. Today I am going to try testing beyond that point.

Has anyone had this prob? Any suggestions? I am getting frustrated, need help! I cant afford to take it to a shop.

Answer 1

is there R13a pressure inside A/C unit?  

Answer 2

Bad low pressure switch?

Answer 3

Make sure that your compressor is getting a good ground. check all the wires running to the compressor and see if you can manually add a ground from your batter to the wire (like with alligator clamps and wire) that should power it on