Air conditioner problems

1999 CHEVROLET EXPRESS
240,000 MILES • 5.0L • V8 • 2WD • AUTOMATIC
Avatar
CARLSHONDAS85
  • MEMBER
  • 2 POSTS
The air conditioner compressor is not getting power, i used a power probe to apply power to compressor and the compressor kicks on and blows cold air, i then went to the relay and was able to jump terminal 87 to 30 with power probe and once again the compressor kicks on and blows ice cold, not sure where to go next.
Jun 14, 2016 at 5:04 PM
Advertisement
Avatar
MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
System pressures may be low enough to activate the low pressure switch which will shut down the compressor, get the refrigerant high and low pressures checked first post the readings here for further assistance.
Jun 15, 2016 at 1:42 AM
Avatar
CARLSHONDAS85
  • MEMBER
  • 2 POSTS
Ok at 80°F the low was around 39psi and the high was 187psi
Jun 15, 2016 at 2:34 AM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,835 POSTS
  • ASE Certified Mechanic
Hello,

Check all fuses, and the pressure switches, here is a wiring diagram to help you check things out

let me know what you find

Best, Ken

Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jun 17, 2016 at 8:40 AM
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 Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.