1997 GMC Jimmy what does these guage reading mean

Tiny
96REALWE
  • MEMBER
  • 1997 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 144,000 MILES
Here are the readings from the manifold gauges LOW side between 25 and 30 HI side between 20 and 25 compressor kicks on and off, jumped the low side pressure switch the compressor stays on but the air from inside doesn't seem ac cold, the accumulator gets very cold and the manifold spy glass doesn't seem to have any flow or movement into the system is this a clog



http://www.2carpros.com/forum/automotive_pictures/61394_IMG_5498_1.jpg

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Sunday, November 7th, 2010 AT 12:27 AM

6 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
Gotta love gauges, they won't lie. Since you have HIGH low side pressure this would most likely be a restriction in the orfice tube (expansion valve).
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Sunday, November 7th, 2010 AT 1:50 AM
Tiny
96REALWE
  • MEMBER
Thanks bluelightnin6 for the help, the orfice tube was dirty and oily and had metalic dust in the oil. Replaced it with new orfice tube accidentially push it in a 1/4 inch farther than the old one hope that isn't a big deal. Anyway went by a mechanics shop who said he would evacuate the system with his recovery unit for free but charge he he had to use freon he also said that it seems to hold vacumn, so went to my shop replaced the ofice tube put the car back together hooked up the manifold gauges jumped the pressure switch and tried to recharge the system but no luck the low side reading went to between +15 and +20 and pretty much stayed there a little movement but not much. The high side reads between +15 and +20 and pretty much stayed there. Close the high side valve and the low side drops to about -15 but goes right back up when you open the high side again. Is this a compressor problem?
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Monday, November 8th, 2010 AT 11:49 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
So low side seems fine, high side is extremely low?
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Tuesday, November 9th, 2010 AT 12:02 AM
Tiny
96REALWE
  • MEMBER
Yes both sides read about the same around +20 and pretty much stay there. You can lower the reading on the low side by closing the manifold gauge on the high side but other than that it doesn't change much.
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Tuesday, November 9th, 2010 AT 8:42 AM
Tiny
BLUELIGHTNIN6
  • EXPERT
Hate to say it but since orifice tube was just replaced I would be replacing that compressor.
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Tuesday, November 9th, 2010 AT 7:41 PM
Tiny
96REALWE
  • MEMBER
Thanks bluelightnin6 I was pretty sure with the lack of movement in the spy glass that the pump wasn't pumping, question? Before evacuating the system the accumulator got very cold now no temp change don't understand that, compressor must be so weak that it can't suck in enough charge in to get back to that level?
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Wednesday, November 10th, 2010 AT 10:18 AM

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