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AC pressure sensor

Tiny
BILLMILL5050
  • MEMBER
  • 2002 PONTIAC FIREBIRD
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
  • 87,000 MILES
How would I ckeck if ac pressure sensor is good I'm getting code p1639 thanks
Tuesday, August 30th, 2016 AT 12:34 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Examine the data with a scan tool and you can see what pressure the sensor is signaling to the computer.
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Tuesday, August 30th, 2016 AT 3:03 PM
Tiny
BILLMILL5050
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  • 66 POSTS
P1639 IS MANUFACTURERS COMPUTER AND AUXILIARY OUT
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Tuesday, August 30th, 2016 AT 10:51 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
It is a three way pressure switch, use this wiring diagram to help you.
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Thursday, September 1st, 2016 AT 1:21 PM
Tiny
BILLMILL5050
  • MEMBER
  • 66 POSTS
Is this it? Will the ac leak if I take off? Does it un-screw? Thanks all I appreciate it
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Thursday, September 1st, 2016 AT 1:53 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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.
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Thursday, September 1st, 2016 AT 3:00 PM

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