Last year The A/C unit in my '85 z28 5.0 was serviced. Everything recharged and running great. Towards fall, I could hear the bearings in the unit rattling around. Short of putting wear and tear on the unit over winter, I took the belt off. In this 98 degree heat wave here I put the belt back on. Switched the lever to max a/c the pulley turns but the unit clasp in from that grabs onto the pulley, isn't engaging. Fuse is good. All connections good. What goes on?

 

There is a low pressure compressor cut out switch in line with the compressor clutch coil. If the charge in the system is low, the switch will not allow the compressor clutch to engage. The switch is located on the accumulator, on the passenger side. There are a set of '85 schematics on line at:

http://www.geocities.com/vtcamaro/Wire-Diagrams.html

Tim