CNBZ34 Posted July 11, 2007 Report Share Posted July 11, 2007 So my AC is kaput. ALLDATA indicates to me that the low pressure switch is located on the rear of the compressor. I want to locate it in order to try to jump the connector to manually make the compressor cycle to determine if I indeed need a re-charge or replace the switch. Problem is, I have looked over every inch of the system and I cannot find that dang switch. I was able to locate the high pressure switch but not the low pressure. Can anyone shed some light on this as to the location? It's refered to as either the low pressure switch or compressor cycling switch. FYI, system has already had a R134a conversion. Quote Link to comment Share on other sites More sharing options...
slick Posted July 11, 2007 Report Share Posted July 11, 2007 Why not just read the pressure in the line with a pressure guage? That alone will tell you if you need to add refrigerant or not. Quote Link to comment Share on other sites More sharing options...
CNBZ34 Posted July 11, 2007 Author Report Share Posted July 11, 2007 I do not have a pressure guage. i just want to quick find the potential problem. if it requires a recharge, then i will purchase a kit. I just would rather not buy it if I do not need it. By manually cycling the compressor is a quick way to determine if it works or not. Quote Link to comment Share on other sites More sharing options...
IRONDOG442 Posted July 11, 2007 Report Share Posted July 11, 2007 They make a recharge can with pressure gauge right on top of it, $25 around here. its a large can too like 16 ounces or more so its like getting a pressure gauge for about $7 For $7 I would just buy one !!! Quote Link to comment Share on other sites More sharing options...
CNBZ34 Posted July 11, 2007 Author Report Share Posted July 11, 2007 I thought about it however, if I can locate the cycling switch and jump the plug with a paperclip, I will immediately know if it's even worth going to the store to buy it and weather or not my compressor even works. The system was comverted and charged approx 3 or so years ago. if it's empty, obviously there is a leak and I'm not going to bother pumping refridgerant into it. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted July 11, 2007 Report Share Posted July 11, 2007 STOP! DO NOT mess with the pressure switches. On our cars... they are not 'on/off' switches, they give the pcm variable readings... and you could FRY your PCM!!! find the a/c relay. pop the cover off. manually trigger it. does the compressor activate with the engine on (climate controls setting does not matter) next. find the low port. press the schrader valve pintle in momentarily (1/2 second). does refrigerant escape or just a light poof? Quote Link to comment Share on other sites More sharing options...
CNBZ34 Posted July 12, 2007 Author Report Share Posted July 12, 2007 Thanks for the heads up, I will try this tonight. A/C works great in my truck so I'm driving it for now. Quote Link to comment Share on other sites More sharing options...
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