A/C blows cold then hot

Hello, I have a 2000 F350 diesel 2wd with 133000 miles. The A/C blows cold for about 10 minutes after I start running it, then it goes hot. I already replaced the cycling switch, and topped off the freon. After I turn the ac off for a while then turn it back on and it blows cold again for a while then hot.

Okay, I drove the truck until the A/C started acting up. I observed the compressor clutch activity. The clutch would kick on and off until it started to blow hot air. When I opened the hood I found that the compressor clutch was stuck (not moving, I'm not sure if that means it was on or off). I connected the gauges and the low side pressure was sky high! I jumped the wires like you said at the connector and the clutch kicked back off (or on) and the gauge pressure dropped into the normal zone. So, what should I do next? I just replaced that switch, so is something else bad?

That is actually the second time I have replaced that switch. Both times it did nothing. Is there no other way that it could be something else? I will try to call ford and buy from them. The previous 2 parts I bought from auto parts stores like Napa and Carquest.

I think I may have done something a little stupid. The connector has 4 plug ports, while there are only 2 plugs from the switch. Only 2 of the ports on the plug connector have metal contact in them. I think I plugged it in so that the plugs were not contacting the ports correctly. I know. Laugh at me if you wish. I will try to plug it in correctly and let you know the outcome. Ha Ha! I hope we have all made these simple mistakes.

I bought another switch, which was my third one in about 2 months. This time from Ford dealer. I got the same problem, hot air after a while. I jumpered the wires again and the compressor kicked on just like before. Is there something else it could be? You said there is one other thing you could think of.

the gap was at.02 inches, but the front of the radiator and the rear of the condenser are both cover with junk. I will clean this off with your tool. Hope it works. I will let you know.

I replaced the cycle switch 3 times, so I know that is working, and I made the tool you described and blew out a bunch of sand and junk from both the radiator and the condenser (and the other coolers that are there). My test drive revealed the same old problem. I agree with the diagnosis about the compressor clutch not engaging because of heat, because the clutch stops working a lot sooner when the outside temp is hotter, or when I am doing more stop and go driving. So, is there anything else I can do? Or do you think I need to start replacing things?

I tapped the clutch face with a hammer ever so slightly when it was stuck, and on it came! So, I am curious. Is there something I can replace to help the clutch from sticking, or do I need a whole new compressor?

Sounds like it is not cycling? Any ideas?