ac pressure sensor

2002 PONTIAC FIREBIRD
87,000 MILES • 3.8L • V6 • RWD • AUTOMATIC
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BILLMILL5050
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How would I ckeck if ac pressure sensor is good I'm getting code p1639 thanks
Aug 30, 2016 at 12:34 PM
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WRENCHTECH
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Examine the data with a scan tool and you can see what pressure the sensor is signaling to the computer.
Aug 30, 2016 at 3:03 PM
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BILLMILL5050
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P1639 IS MANUFACTURERS COMPUTER AND AUXILIARY OUT
Aug 30, 2016 at 10:51 PM
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STRAILER
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It is a three way pressure switch, use this wiring diagram to help you.
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Sep 1, 2016 at 1:21 PM
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BILLMILL5050
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is this it? will the ac leak if I take off ? does it un-screw? thanks all i appreciate it
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Sep 1, 2016 at 1:53 PM
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WRENCHTECH
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It may have a schraeder valve under it to hold the refrigerant but I wouldn't take the chance that it may not. I would evacuate the system first.
Sep 1, 2016 at 3:00 PM
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