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

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?

8 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

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

Roy

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Sunday, June 10th, 2012 AT 2:53 AM

ROYCAR71

MEMBER
354 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

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

ROYCAR71

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354 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

ASEMASTER6371

MECHANIC
52,797 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