Air conditioner not working

Hi, I own a 2003 Ford F-250 Truck, with a 6.0 Turbo Diesel Engine. It is a 4 x 4 with approximately 92,000 miles. The A/C is not working, so opened the hood and noticed the compressor is not engaging. The fuse is okay, so I thought it might just need to be recharged, so I bought an Artic Freeze R134a kit. I hooked up to the low pressure side, and the gauge said the system was overcharged.

Here is what happened. When I disconnected the switch, I noticed a slight engine rpm decrease. When I jumped across the two wires on the connector I get a slight increase in rpm same as with the switch connected. Nothing else changes, no compressor rotation, or fluctuation in pressure. (Note: I have verified that the compressor turns easily by hand). Thanks again.

I started the engine, turned on the A/C, climbed under the truck and tapped on the compressor hub/clutch assembly as instructed. The clutch is still not engaging after much tapping. I did notice that the clutch assembly seemed pretty wobbly inside the hub. I understand they have springs inside to aid in disengagement, but I was surprised that the springing action was as light as it is. Does this sound normal?

I crawled back under the truck, and verified that the compressor rotated freely. I checked for side to side movement, and did not find any, but I did notice that the front plate seemed to move forward a little as I jiggled it. I pulled it fwd as I wiggled it, and it came completely off in my hand. Turns out that the retaining bolt has fallen out. Do you suppose that if I put in a new bolt it will work?

Stopped by the auto parts store, picked up a 6 mm-1.0 x about 3/4" long. Installed the clutch plate. Installed the bolt. A/C is now working flawlessly. Wish I would have used a mirror and noticed the bolt missing a couple of months ago. LOL. I am just happy to have it working, and even more happy that the cost was under two dollars. Thank you for all your wise counsel. I am now cool. Thanks for having this site

I have a 1995 ford F-250 super with a 7.3 liter diesel engine. The A/C has not worked since I got it. So I thought it might be a matter of just charging it. So I went to Kragens auto store and bought the r-134 easy charge with the gauges. Followed the steps by putting the hose on the low side and filled it until the gauge showed me when to stop. It is holding fine at that position so there is no leak, but the A/C is still not working.
How can I check the compressor to see if it is working? Or have you any ideas as to what is wrong?

Yes I have a test light. I had power at the purple wire so I crossed the purple wire and the other wire like you said and I could see the compressor kicking in. I cannot tell if the A/C is cold or not cause it is actually cold where I am today, but this definitely made a difference. As soon as I put these wires into there proper place again the compressor would click back out again and stop.

Before I jumped the two wires the gauge read 25psi. When I jumped them it went straight to zero. I filled the system up to 35 psi and I re-connected these wires in there proper place and I notice now that the compressor is cutting in and out every couple of seconds. :) I checked the gauge again and ts holding steady at 35 psi. I live in San Francisco city and today is windy and cold so I cannot tell if it is blowing cold or not because when I switch to vent it seems the same.

Did that but compressor is still cutting on and off and can of Freon is nearly empty. When it cuts off it reads about 35 psi and when its comes back on it drops to zero. Also, I noticed water dripping out from under it. Maybe there is a leak in it after all?

What does this mean?

Thanks a lot

V8 four wheel drive automatic 110,000 miles.

My A/C was running really cold (as in freezing) until yesterday where it stopped running. Hot air came out the vents after the engine warmed up. The fan is still going and when turning the switch to A/C. I can hear the air valve changing position? I have checked the fuse box and the compressor belt is okay. Also, it does not go into defrost position.

How do I troubleshoot the problem from here?
Thanks