My 96 f150 6 cylinder, suddenly stopped blowing cold air. The system has adequate r-134, low pressure switch has good voltage as does the high pressure switch and power connector at the clutch. Tried jumping both high and low pressure switches and nothing. Ran a bypass to the clutch terminals, directly from the battery and nothing. I can turn the clutch by hand. The fuse is not blown. I don't know if the a/c has a relay but I swapped all of the relays in the box and no change.
Any help would be greatly appreciated.
Thanks

 

Check your vacuum hoses top left corner under hood.Just fixed mine last week.

 

Thanks for the feedback.
I checked them but didn't find anything wrong with the vacuum lines.

 

Could be in the clutch itself if it won't grab. Powered up, I believe it should lock up and make the compressor turn.
If that part's working ok then you may have a restriction (dryer, condensor, evaporater, most likely).
Properly operating, the compressor will pressurise (compress) the freon, pump it through the cab where it picks up heat, and out to the front of the truck where it expands and releases the heat which is whisked away by airflow, then gets compressed again. Really simple system.

 

Clutch does not engage. I can turn it by hand so it's not locked up.

 

If you put power to it and it didn't engage, it sounds like you need a clutch.

 

I agree with Chris. If you put direct power to the clutch from the battery and it didn't engage then the clutch is your problem.

 

Yes, it is sounding like the clutch. Is that a DIY repair or pro?
thanks for the feedback.