LT4 A\C problem

[GentleBen]

Here's hoping JMJunkie is checking the site, you seem to know all things Corvette.

Had the first serious buyer look at 96 LT4 today and much to my surprise the A/C wasn't working. It was working fine the last time I used it but I almost always have the top down so it hasn't really been on for about 4 months.

The pressure plate just keeps popping in and out of the rotor every five seconds or so and the compressor never comes on.

Do you think I have a major problem here or is it something minor. Saw a post Junkie had on another site about shims but not sure it was the same problem.

Thanks in advance for any insight.