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92 Vette AC Clutch or ?

92vette on Wed April 21, 2010 6:54 PM User is offline

Year: 1992
Make: Chevy
Model: Corvette
Engine Size: 5.7L
Refrigerant Type: R-12
Country of Origin: United States

Hi Everyone,

I'm about to order a clutch (instead of compressor + clutch) for my Vette but would appreciate a 2nd opinion before I go down that path.

My compressor shaft wasn't siezed but the clutch/pulley was and there was a little bit of dark black gunk that was sprayed around the engine compartment.

I took off the clutch assembly & see this hardened substance covering the stator (the same stuff that probably locked the stator to the rotor & seized the clutch):

Does this look like normal clutch failure to you or is this possibly from a compressor leak that caused a clutch failure? (In other words, what is that substance?)
I could save a few hundred if I just fix the clutch, but if it turns out that the compressor needs to be replaced, it will cost a lot extra to purchase a clutch & then a compressor (with clutch).

Here are some other pics that may help with a diagnosis:


Thanks in advance!

mk378 on Wed April 21, 2010 7:46 PM User is offline

Looks pretty badly burnt up. Is there any refrigerant left in the system? Compressor seal may have failed from all the heat.

NickD on Wed April 21, 2010 8:57 PM User is offline

Will see oil leaks around the compressor shaft if the seal is leaking, bet that area also needs a clean up.

Not sure what that crud is on your coil, looks like mud. Most important thing is to apply 14.5 volts to the coil terminals and check to see the current flowing through it is not much more than about 4 amperes. And as the coil heats up that current should tend to decrease. If the current increases, the coil has internal shorts. If looks okay, clean it up and spray some varnish on the coil wires. I have seen a lot worse coils than yours with black wire, broken, and falling out of the shell.

Damnned peening on your pulley bearing. Bet that needs cleaned and greased inside or just replaced if that is your choice, you don't show a surface shot of your pulley, but judging by the hub, surfaces aren't that bad. That can be cleaned up on a lath, or just cleaned up, see more crud than anything else.

But if the coil is bad, believe the only way to buy new one is with a complete clutch kit. Ask Tim when he wakes up from his nap.

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