Question about GMC K1500

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I have a 1993 GMC 1500 4.3 litre V-6 automatic transmission pick-up with air conditioner problems. I replaced the compressor (with Clutch) accumulator,orfice tube and suction/dischange manifold hose over the weekend,and after charging the system with new R-134(3.5 regular sized cans)the system started working very well. After running for about 10 minutes the AC compressor clutch started cycling on and off and eventually the AC clutch will only engage for about 5 to 10 seconds and then disengage. I think I may now have a problem with a switch of some sort that tells the system when to engage or disengage.Could you tell me if I am on the right troubleshooting road and if so what would the switch be called and where is it located on this truck?If I missed the troubleshooting problem,what is the problem?

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In general I don't recommend anyone do a/c work at home because it requires equipment that most people don't have, such as a good set of gauges (not the little one on a can dispenser) and an evacuation pump. both are expensive and likely if you had them you would end up using them about once every four or five years....additionally, most people just do not have the experience to diagnose a system. But, since you are into it already, I see a couple of items missing from what you said...You did not mention evacuating the system...after doing so, you need to watch the gauges and see if system holds vacuum, (should hold 21 inches of vacuum for about twenty minutes)...If not, you have a leak somewhere that hasn't been repaired. Because you charged the system, does not mean that the freon stayed in there. That will give you the exact symptom you reported. Second, if system was open and humidity level was high, your system contains a slug of humid air that can cause freezing inside the system, causing the expansion valve to fail to operate. This would have not happened if system was purged. If you have gauges, check that pressures are normal...Overly high pressure on either low or high side will indicate internal problems. You can jump across either low or high pressure switch to restore operation long enough to get readings. If after jumping sensors you find that all pressures are normal (there is a chart to compare ambient temp with pressure readings and temp at dash vents), then either switch is not operating or you may have an under-dash thermostat that is bad or not set correctly. As you can see, there is a lot more to servicing a/c than just putting inj parts and freon. (I could write twenty more pages on this and still not touch on everything you need to know)
Bottom line on your problem may be a leak you haven't found yet. That's the first place I'd look. Most leaks are at either front compressor seal, (you changed that with compressor) or the evaporator core in the heater box. (also re-check any connections you worked on) Good luck!!!

Posted on Jul 12, 2009

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#46-12-03: AIR CONDITIONER BLOWS WARM AIR (REPLACE A/C DELAY RELAY) - (Apr 7, 1994) 999999995.gif REVISION: 04/14/94
THIS BULLETIN IS BEING REVISED TO CORRECT THE TRANSMISSION LISTED IN THE MODELS. ----------------------------------------------------------------------
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