I have a 2002 F250 on which the AC compressor clutch is not cycling: I have checked and added coolant so low pressure is correct (don't have high pressure gauge). I checked the clutch air gap and it is at 0.030 " as specified in another post. I replaced the low pressure AC cycling switch (on the evaporator/dryer). With the AC on, I disconnected the AC cutoff switch and the clutch disengages. This circuit has the correct (>10V) going to it. I am thinking it could have something to do with the AC relay. Any ideas, suggestions?

Note: When you switch the ATC to a setting other than AC or Max AC, the clutch disengages fine.

I noticed this problem because the AC shuts off when it is really hot, after I have been driving for a long while, about 1 hour or more. If you shut off AC, wait a few minutes, then turn on it works fine.

 

Have you checked the orfice tube for debris?

 

I have not. Can you do that without opening up the system. I don't have all the gauges and equipment to evacuate.

 

Don't bother. That problem cannot cause your situation. See your other thread.