AIR COMING OUT OF LOW AND HIGH PORT A/C SYSTEM

  • Tiny
  • roycar71
  • 1998 GMC Jimmy
  • 6 CYL
  • automatic
  • 125,708 miles

I just changed out my evaporator and accumulator. I did a evacuate(with my gauges and vacuum) and low and high port goes back to zero after I turned off my vacuum. When I put a empty can of freon with air to see if air holds I hear air coming from low and high part, but when I put caps on them the air stops. Is this common?

Sunday, June 10th, 2012 AT 2:45 AM

8 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

No, the service valves are leaking and must be replaced.

Roy

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Sunday, June 10th, 2012 AT 2:53 AM
  • Tiny
  • roycar71
  • Member

I can understand the high port. I just changed the accumulator not more than 2 hours ago, and that has my low port.

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Sunday, June 10th, 2012 AT 3:00 AM
  • Tiny
  • cadieman
  • Expert
  • 3,785 posts

Check all your connections. When u vacuum down the sys. To -28 to -30 tighten down the low and high side gauges turn the pump off and the vacuum should stay their for 15 minutes. Only then u can fill it.

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Sunday, June 10th, 2012 AT 3:08 AM
  • Tiny
  • roycar71
  • Member

That is not possible if my low port and high port is leaking right? As stated earlier, I just changed out accumulator that has my low end port. When put air in it air comes out of portss but stops when I put caps on Them. I am process of going to autozone to replace high port but can not screw off low port of accumulator. Thanks.

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Sunday, June 10th, 2012 AT 3:17 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Yes, it can hold vacuum with the gauges but leak when removed. The caps are just dirt covers, not sealers.

You need to replace the service valves.

Roy

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Sunday, June 10th, 2012 AT 3:31 AM
  • Tiny
  • cadieman
  • Expert
  • 3,785 posts

If the accumulater is leaking return it its new. Use a valve core tool to remove the schrater valve on the high side hose and replace it.

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Sunday, June 10th, 2012 AT 3:49 AM
  • Tiny
  • roycar71
  • Member

I have concluded that is the high port. Yes, I will replace valve. Thanks.

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Sunday, June 10th, 2012 AT 4:05 AM
  • Tiny
  • cadieman
  • Expert
  • 3,785 posts

Make sure u get the that is for a/c valves if it does not help you will have to replace the high side hose also.

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Sunday, June 10th, 2012 AT 4:36 AM

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