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I have been working the refrigerant pressure sensor issue on a 2002 Cavalier. On that model (l'm quite sure the 02 and 03 are the same) the RPS is located on an the smaller diameter aluminum high pressure refrigerant line coming from the compressor. Look on the passenger side of the car (US) sort of behind the headlight and a little toward the driver's side. There is a cross-member that goes from passenger side to driver's side--look up underneath that cross-member next to the radiator. You'll see a high pressure fitting (with red cap) and the refrigerant pressure sensor next to that--it has a three-wire connector. Hope this helps!

johnw10257@Yahoo.com

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Q: Where is the refrigerant pressure transducer located on a 03 cavalier?
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