Engine Size: 3.3
Refrigerant Type: R-134
This spring, I noticed some compressor noise, and the A/C would either work or it wouldn't. When it worked, it cooled well. The system totally quit Saturday; the clutch would not engage, but the system seemed to have a full charge. I could still turn the compressor by hand after the clutch shut off.
I checked the pressure switch, and it was working fine -- on at ~100 psi. So I recovered the system and pulled the compressor. The compressor still turns rather easily by hand. The clutch, however, has a gooey, rubbery, sticky substance all over the place, as seen in the photos.
What could cause this? Of course, I'm hoping someone will tell me the clutch just failed and I don't need to disassemble any further to check for compressor bits in the TXV screens.
Here is the face of the clutch on the compressor after removing the outer part.
This is the same thing with the other half of the clutch lying next to it.
Other half of clutch, disassembled.
close-up of disassembled clutch
close up of clutch, disassembled.
Home of the "Tunex Suburban Disaster"
Edited: Mon July 18, 2011 at 5:50 PM by mitchedo
Clutch was unable to handle the torque transfer to compressor- either clutch was oily/greasy feom leaky shaft seal and slipped due to grease--- or compressor went through a high torque mode and caused clutch to slip---once clutch starts slipping, it melts all the rubber torque cushion elements and clutch is toasted---
Since compressor turns easily, I would opt for scenario number one, your clutch had oil on it, and started slipping when high torque was present---you can try a new clutch, but chance are your shaft seal is the root cause--so I would opt for a new compressor-- clutches usually cost more than half the price of a new pump anyway.....
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
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