I bought an '84 F-250 6.9L diesel about nine months ago. The a/c doesn't work, and in this south Texas heat and humidity having an a/c is almost a necessity. I know that the compressor clutch is not engaging. The system doesn't seem to have pressure in the lines. Should I replace all of the O-rings in the lines, charge the system, and see what happens? I haven't a clue when it comes to a/c systems. Any help would be greatly appreciated. Thanks

 

You probably should consider converting to R-134 if it hasn't been done yet.

Read the first post on this A/C board about the conversion process.