Noisy AC pump

[eccs19]

Working on getting my car back on the road. Car is running, but very noisy. Removed alternator/ AC belt and now purrs like a kitten. Alternator works and a bit noisy, but not bad. The AC pump is very noisy when not engaged. At this point I don’t care if the AC is working or not. Can the bearings be easily replaced with the unit in the car, or is it best to replace the whole pump? Or even a pump delete option?

[dr bob]

The compressor clutch bearing is the typical culprit for the noises you describe. It's possible to change it with the compressor still connected to the car by the hoses, usually with the compressor sitting on a box under the nose with the car raised up a foot or maybe more. Dis connect the clutch wire before unbolting.

There are plenty of youtube videos showing the procedures, better than my narratives. Keep track of the shims on the shaft, and do follow the guidance on setting the clutch clearances. There are snap rings that demand a snap ring pliers for ~~2.5" internal rings, the one that retains the bearing in the clutch housing.

I usually remove the compressor completely, and treat it to a full refurbishment on the bench while it's out. That clutch bearing carries the radial load from the drive belt, while separate bearings carry the compressor shaft and swash plate loads. There are full overhaul kits available that include the bearings and all the seals. And remember that patience, extreme cleanliness and serious care is essential for success. Lint-free towels, gloves, and extreme care to not damage any sealing surfaces will help with your success.

[Petethepug]

I’ve got the OEM Denso swashplate compressor on my 94 968. It loses its cooling effect on 90+ days in traffic. It’s a design issue. I’ve got a (Sanden) Kuehl wobble plate compressor kit going in with a new alternator during next service.

https://griffiths.com/product/944-1-kue ... t-83-85-1/