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

1998 GMC JIMMY
125,708 MILES • 6 CYL • AUTOMATIC
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ROYCAR71
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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?
Jun 10, 2012 at 2:45 AM
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ASEMASTER6371
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no, the service valves are leaking and must be replaced.

Roy
Jun 10, 2012 at 2:53 AM
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ROYCAR71
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I can understand the high port. I just changed the accumulator not more than 2 hours ago, and that has my low port.
Jun 10, 2012 at 3:00 AM
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CADIEMAN
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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.
Jun 10, 2012 at 3:08 AM
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ROYCAR71
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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.
Jun 10, 2012 at 3:17 AM
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ASEMASTER6371
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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
Jun 10, 2012 at 3:31 AM
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CADIEMAN
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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.
Jun 10, 2012 at 3:49 AM
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ROYCAR71
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I have concluded that is the high port. Yes, I will replace valve. thanks.
Jun 10, 2012 at 4:05 AM
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CADIEMAN
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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.
Jun 10, 2012 at 4:36 AM