A/C is not blowing cold

2004 CHEVROLET TRAILBLAZER
180,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC
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DESHONGAR
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The other day I went to town and my A/C was blowing fine like usually, when I got home I noticed my air stop blowing cold.
I popped the hood to notice the air compressor wasn't spinning like it should, it would spin fast for a few seconds then lag then speed up the lag.
So I went to a mechanic and he thought it could have been low so he add more Freon (2 and a half small cans).
It got a little cold and the pulley wasn't lagging as back.
So I took it to another mechanic and he used his gauge from the Freon and it was in the red, so he released some out until it got back into the green on the gauge.
The compressor started back working and the air was colder than it even been.
Now a day later it's back to not being cold and I did the same he did and it's still in the red and it's blow out air air as well.
I also notice while the compressor running the high is bubbling and the low is making a hissing noise. Does anyone know what it could be?
Sep 6, 2019 at 7:11 AM
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ASEMASTER6371
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Good morning,

The high is bubbling? Please explain?

It sounds like the Freon has leaked out. You will need to have the system checked for a leak.

https://www.2carpros.com/articles/air-conditioner-leak-detection

Do you happen to know the pressures on the high and low side?

Roy

Sep 6, 2019 at 8:19 AM
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DESHONGAR
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It's a little ball in it and it's has bubbles around it, it only happens when the air is on.
I will send a video and photos once I get off to show you.
Sep 6, 2019 at 8:21 AM
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ASEMASTER6371
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Sounds like a plan.

Roy
Sep 6, 2019 at 8:31 AM
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DESHONGAR
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Okay, so I was going to record a video but it wasn't doing it anymore, but now the compressor runs just fine but still blow hot air. When you turn it on the RPM gauge goes down then goes back up. Like it lost a little power.
Sep 9, 2019 at 9:36 AM
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ASEMASTER6371
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Okay, I still need the pressure to make sure the system is working correctly.

It could also be the blend door actuator if the A/C is working correctly.

Roy

Sep 9, 2019 at 9:46 AM