Air coming out of low and high port A/C system

Tiny
ROYCAR71
  • MEMBER
  • 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 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 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
  • 363 POSTS
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
  • MECHANIC
  • 3,544 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
  • 363 POSTS
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
  • MECHANIC
  • 52,796 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
  • MECHANIC
  • 3,544 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
  • 363 POSTS
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
  • MECHANIC
  • 3,544 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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