I have a Calsonic compressor (model 73111 FE021 3B463 45010) that when the clutch kicks in you can watch the center hub slip and it makes a loud screeching noise.
How come I can't find replacement clutch parts anywhere? Is the only option to replace the whole compressor?
Does any one have any experience with this symptom? Would taking it apart and cleaning the surface do anything. The Subaru manual doesn't say what the gap should be.
A rule of thumb for a clutch gap is a regular business card.
Smaller gap might help. You should be able to take the shaft nut off and remove the plate, then take out some of the shims on the shaft. The surfaces are metal on metal and there's no need to clean them unless they have oil on them. Oil could be coming from a bad shaft seal.
Does the compressor turn freely by hand? It may be about to seize on you anyway, and the whole unit must be replaced.
Are you sure it's not just the belt slipping?
If it does this after it has been running a few seconds, you could have excessive head pressure because of overcharging or inadequate condenser cooling.
The center hub turns by hand.
The belt chirped before I put a new belt and tensioner on. Now it squeals when it cycles on. You can watch the hub (the front part with three cylinders on it) slip.
What are the pressure readings at idle and 1500rpm?
Not really as you most likely are not exceeding the normal operating pressures at that low of an ambient.
Are you sure that the compressor is engaging now that it is cold out? There are so many things that can cause a slipping clutch...head pressure, corroded or dirty wire connections, a compressor that is seizing up, excessive air gap(although from your picture it doesn't appear to be too much), a weak field coil, etc. I agree with mk378, you could try removing a shim from under the hub and when the hub is off check the surfaces for oil or rust and clean them accordingly. If you try removing a shim just make sure that no part of the hub rubs against the pulley when it goes back together. That could cause heat and give you even more problems.
Doubt poster would be getting much moisture removal if it was not engaging. Poster has not mentioned the defrost not working so I assume it is at this point. Hub looks burnt to me which is a sign of the compressor starting to lock up or a degree of resistance. During higher ambients I'm thinking the system could be over charged or have a high pressure issue do to some related problem. Clutch gap looks fine to me but image could be misleading. If the gap is close to 20 thousandths I would not worry about a shim.
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