Not real sure about the 92'*, however, there may be a pressure switch/sensor that provides input to your PCM which enables drivers for A/C clutch relay pick up. Pressure sw. maybe faulty? (clutch permissive interlock)

Thanks for the response. I checked the pressure cycling switch connection and fixed a cracked vacuum line.I also took a look at the evaporator core, which looked relatively clean. Finally, I tried disconnecting the positive terminal of the battery.

When I restarted the car, the compressor immediately engaged and it cooled down very well. I'm not exactly sure why this happened, but my hunch is that the climate control was reset because of the battery disconnect.

This was my first post after recently finding this site. The information available here and the experienced advice are incredibly helpful. Thanks again.

Is it pretty expensive to have the R12 ac up, or did you have it coverted? how expensive is it?

The Freon itself, last I checked (last year), was going for somewhere around $65/pound, although the service place I used was measuring it out in ounces, as they should, so in other words I didn't have to pay for some jerk trying to round up to the next full pound on the bill.

I had mine recharged with R12 as I had just installed a new evaporator myself, and the rest of the system was intact and in very good shape, so it seemed like a safe bet and allowed me to keep the car all original. But if you're paying somebody retail repair prices (with labor) to have a new evaporator/condensor/compressor/other component installed, and you're not sure when the next part'* going to fail and leak stuff all out again, I would suggest having the system converted to R134a now.

That way, if disaster strikes and you lose it all, the replacement refrigerant will be cheap, and further down the line, you can do your own routine spring topping-off recharges yourself with over-the-counter R134a kits.

The low freon code is unique because it is stored in the PCM, not the HVAC, so it must be cleared by resetting the PCM... And that is done by disconnecting the battery for a few minutes. Looks like you figured it out.