ac pressure sensor

2002 PONTIAC FIREBIRD
87,000 MILES • 3.8L • V6 • RWD • AUTOMATIC
Avatar
BILLMILL5050
  • MEMBER
  • 66 POSTS
How would I ckeck if ac pressure sensor is good I'm getting code p1639 thanks
Aug 30, 2016 at 5:34 AM
Advertisement
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Examine the data with a scan tool and you can see what pressure the sensor is signaling to the computer.
Aug 30, 2016 at 8:03 AM
Avatar
BILLMILL5050
  • MEMBER
  • 66 POSTS
P1639 IS MANUFACTURERS COMPUTER AND AUXILIARY OUT
Aug 30, 2016 at 3:51 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,649 POSTS
It is a three way pressure switch, use this wiring diagram to help you.
Image (Click to enlarge)
Attached Media
Sep 1, 2016 at 6:21 AM
Avatar
BILLMILL5050
  • MEMBER
  • 66 POSTS
is this it? will the ac leak if I take off ? does it un-screw? thanks all i appreciate it
Image (Click to enlarge)
Attached Media
Sep 1, 2016 at 6:53 AM
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 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.
Sep 1, 2016 at 8:00 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle