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My A/C was not working so I discharged it completely, vacuumed out the system, put dye in the system, recharged to correct high/low pressures, turned it on and the compressor did not kick on. So I jumped the low pressure switch momentarily and wow, cold air. I figured my low pressure switch was bad, so I replaced it. This fixed the problem for about five days, then all of a sudden the compressor would not kick on. Inspected for leaks(dye) and found nothing. So I replaced the low pressure switch again. It worked again for about two days then shit on me again. Replaced it again, worked, three days later, no compressor. Why am I blowing these low pressure switches? Please, throw out what you know.:guns:
 

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You have to have your truck running with A/C to max to correctly fill your system back up. Try turning your truck on and setting your A/C to max and then see what you are reading. You probably need to add more refrigerant.
 
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