It was still noisy after changing the coil. Ordered a new compressor. Mounting hardware was tight.

Thanks for all the replies.

I have the coil off and will try a different coil tomorrow. If it still makes noise, I’ll recover some refrigerant. I think 40:oz was the factory r12 charge. System currently has 36 oz of r134a in it. Low side was sweating heavily all the way back to the compressor. Over charge might be a possibility.

Well, I changed the bearing and still have a noise. Also tried a different hub plate. Only thing I haven’t tried is a different coil and pulley. I put a stethoscope on the compressor and it sounds good.

Is it possible that the coil is weak and letting the clutch to slip and causing it to make noise?

I had some success! Greased up the vacuum control switch with silicone grease and reinstalled. We have cold air blowing out the vents! The metallic noise is still there. Only when the clutch is engaged. I took the hub and hub plate off and didn’t see any problems. Reinstalled the clutch and set to ....

The rotary vacuum switch on the AC and heater control is leaking. No luck finding one locally so far.

I adjusted the clutch gap down to .022 and it seemed to be less noisy. Took the covers off the underside if the dash. Pretty sure I can hear a vacuum leak, but can’t tell which direction it’s coming from.

Also seems to be a lot of chatter from the clutch. I set the gap at .030. Is that too much?

It’s a 2.8 liter.
Any particular line or just start checking all the vacuum lines I can locate?

Just converted this truck for a friend. Ac hasn’t worked in many years from the looks of things. Changed the compressor, accumulator, orifice tube, and added 6 oz pag 150. Pressures are good and lots of water coming from the evaporator, but air blowing in the cab is in the upper 60s and only blows o...

It was still working as of yesterday.

When we were troubleshooting over the phone, he said the clutch was turning. I’ll post a reply if we ever find out what happened.