I had the same issue last night. Everything was fine, jumped both pressure switches, checked all fuses, and still no power to the clutch. Then, it just fixed itself. I was turning the ignition on and off the whole 2 hours I was working on it, and one time when I cranked it, the clutch just kicked in and everything was hunkey dorey.

 

Im having some what the same Issue. My AC works fine on my 2003 Navy when its under 85' out side...any things over that my cluth fan does not engage my compresser so I get hot and the cold then hot air coming from the vents. I checked my high presser switch thinking that that it mite be over charged but its coming out just fine..I have also checked the presser and they are fine.

 

My problem turned out to be a bad instrument cluster. My pick-up had automatic climate control and apparently a/c circuits are tied in to the instrument cluster. I replaced the instrument cluster and the a/c now has power and is working fine.

 

Since you FAILED to identify what you have, your comments are not useful and probably do not apply to the vehicle under discussion here.

Why did you feel compelled to post the same almost useless information in so many threads?