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Sounds like you have a pressure sensor cycling the compressor clutch relentlessly. It could be other things as well but the pressure sensors are where I would start. Now, why the pressure sensors are cycling the compressor clutch? I would check your low side pressure first. Maybe your refrigerant level is too low, it could even be too high. Look for any dirty/oily spots thoughout the A/C system that might indicate a leak.
Now would also be the time to consider doing a retrofit to R-134a. You can buy retrofit kits at any auto parts store that will come with instructions on how to do it. Try to find some refrigerant with some stop leak additive in it. I had a leaking compressor and the stop leak worked like a champ. First, I highly recommend you take your truck to an A/C shop and have them evactuate the R-12, flush the system with a solvent, replace the drier and pull the system down to a deep vacuum. This will make it ready for you to perform the R-134a retrofit properly. Don't worry about replacing all of the o-rings, it has never been necessary on Toyotas.
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