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On a 1993 Grand Am (and most other GM front drivers) there is no low pressure switch, instead it has a thermal expansion valve system with a "pressure transducer" located on the high pressure hose. The pressure transducer sends a square wave digital signal to the PCM, which can calculate high side pressure in PSI through a mathematical formula, which in turn sends a signal to the a/c compressor clutch relay to turn on if the pressure is within the set parameters. The a/c pressure transducer cannot be checked with a test light or such, you WILL short the computer if you try!!

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โˆ™ 2008-08-24 01:56:11
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Q: Where is the ac low pressure switch located on a 1993 Pontiac Grand AM?
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