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A/C is making a hissing noise

Tiny
XAVIER_COX
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This is after fan on it and running about 8 to 10 minutes.
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Thursday, July 9th, 2020 AT 2:17 PM
Tiny
ASEMASTER6371
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Okay, you are good. The spec is 1.6 pounds which is 2 12 ounce cans.

Roy
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Thursday, July 9th, 2020 AT 2:19 PM
Tiny
XAVIER_COX
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I vacuumed it down to -30 for 1 hour and made sure there was 6.5 oz of oil within the system.
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Thursday, July 9th, 2020 AT 2:22 PM
Tiny
XAVIER_COX
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Is it normal for the gauge to fall that low when I rev my engine? I should note I put on a heavy duty condenser. But everything said it was compatible.
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Thursday, July 9th, 2020 AT 2:25 PM
Tiny
ASEMASTER6371
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How much oil did you recover when you did the repairs?

The low side should be 25-30 pounds.

Roy
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Thursday, July 9th, 2020 AT 2:27 PM
Tiny
XAVIER_COX
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I didn't not check oil recovery. Figured most was inside either the compressor or condenser when I removed them.
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Thursday, July 9th, 2020 AT 2:28 PM
Tiny
XAVIER_COX
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Could this be a sign the evaporator is bad? It is really the only thing that didn't get replace.
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Thursday, July 9th, 2020 AT 2:36 PM
Tiny
ASEMASTER6371
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The oil in the compressor never comes out. It only will come out when it is removed and drained.

When you recover there should next to no oil recovered at all.

No, to the evaporator. You are good there.

Roy
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Thursday, July 9th, 2020 AT 2:46 PM
Tiny
XAVIER_COX
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Okay cool. So it got replace and came with the correct amount of oil in it and got vacuumed down and recharged with maybe an ounce less of Freon than it should have gotten (because I left some in the 2nd can) but it's not cooling good. What should I look into next? The fans seam to run good and adding an extra fan didn't help. Compressor kicks on and is not noisy.
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Thursday, July 9th, 2020 AT 2:54 PM
Tiny
XAVIER_COX
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I see a connector on the A/C pipes looks like it might be a A/C pressure switch. Is this something to consider changing. Only 27 bucks. I'm not sure if I would need to discharge and recharge my A/C system to change that.
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Thursday, July 9th, 2020 AT 2:59 PM
Tiny
ASEMASTER6371
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No, if it was bad the system would not work.

The low side is too high. That is the issue.

I am concerned there is too much oil in the freon system. You said you added 6 1/2 ounces and that is too much. That could be the issue.

You should have only added 3 ounces at the most.

Roy
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Thursday, July 9th, 2020 AT 3:05 PM
Tiny
XAVIER_COX
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Okay, so what you are saying is I need to take off the compressor and drain out at least 3.5 oz of oil and recharge?
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Thursday, July 9th, 2020 AT 3:16 PM
Tiny
ASEMASTER6371
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No, the oil in the compressor is separate from the oil in the Freon system.

The oil in the compressor is fine.

Did you add 6.5 ounces to the Freon system before you charged it?

Roy
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Thursday, July 9th, 2020 AT 3:41 PM
Tiny
XAVIER_COX
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No, I'm pretty sure the compressor was 4.2 oz already in it. And I added 3.3 oz Most of it went into the condenser and the rest into the yellow line when I recharged it.
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Thursday, July 9th, 2020 AT 4:02 PM
Tiny
ASEMASTER6371
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Okay. Sounds about right.

If you take it on a nice drive, does the temperature go down?

Vent temperature should be 60% of the ambient temperature.

Roy
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Thursday, July 9th, 2020 AT 4:11 PM
Tiny
XAVIER_COX
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Yes interstate driving can get it down to 45-50 degrees.
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Thursday, July 9th, 2020 AT 4:17 PM
Tiny
ASEMASTER6371
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Okay, that is good.

Check the radiator and make sure there is no dirt or debris in the fins. It may be restricting air flow at idle and low RPM causing the temperature to rise.

Roy
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Thursday, July 9th, 2020 AT 4:21 PM

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