crawlinss Posted September 3, 2015 Report Share Posted September 3, 2015 im posting because I am out of ideas. I am a transport refrigeration tech for a living, so i'd like to think Im halfway knowledgeable on a/c systems, but this one has me really stumped. my a/c has been flawless up until this summer. earlier in the year it started acting up, and I attributed it to the fact that up until about a month ago, my truck had a bad parasitic amp draw (aftermarket stereo) and I deleted the cats, and with that, I had a tech at a gm dealer give it a tune so I would not have a check engine light on and still pass emissions (which it does.) the problem with that, is that when the battery is disconnected, the pcm has to relearn so it is very lopey at idle and just off idle for about a week. so lopey to the fact that it sounds like it has an insane cam in it, and you have to build rpm's on the brake coming up to a stop light and while parked. I assumed that the SS a/c system with the transducer and digital display had the ability to watch rpm, and turn off the clutch below a certain rpm threshold. so now the truck is running well, but a/c clutch still does not engage until driving about 15mph give or take. I have been swamped at work, so I threw a clutch cycle switch on it to see if it would work. not only did it not work, I must have overtorqued the switch, because the plastic threads stripped, and leaked out all the refrigerant. ok, no big deal. so I evacuate and recharge the system, and put the original switch back in (the one on the accumulator.) the condenser is perfectly clean, and pressures are optimal while someone holds the rpm's above 1500 or so. it still does not work at idle. it will occasionally, but not consistently as it should. I have a temp probe in the dash outlet, and on the highway it will put out air as low as 52 degrees. at idle the output is ambient. I am very curious what the function of the 3 pin transducer is. if youre standing in front of the passenger side headlight and look down, you can see it on a line just above the compressor. any thoughts? Quote Link to comment Share on other sites More sharing options...
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