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Air conditioner problems

Tiny
CARLSHONDAS85
  • MEMBER
  • 1999 CHEVROLET EXPRESS
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
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.
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Tuesday, June 14th, 2016 AT 5:04 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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.
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Wednesday, June 15th, 2016 AT 1:42 AM
Tiny
CARLSHONDAS85
  • MEMBER
  • 2 POSTS
Ok at 80°F the low was around 39psi and the high was 187psi
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Wednesday, June 15th, 2016 AT 2:34 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
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
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Friday, June 17th, 2016 AT 8:40 AM

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