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Old July 21st, 2010, 12:15 AM   #1
wave_crusher
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Default A/C System Vacuuming/filling

I figured i'd just post this in the general tech section, but this is for a 96 chevy silverado 1500

I need to replace the a/c compressor, the clutch is going bad, it will squeel every once in a while and if I turn the a/c on to engage the compressor. And I really want to have cold a/c in my truck, it'd be nice to have it's another good selling point should I decide to sell it

Anyway, my question is, what exactally do you have to do after replaceing the compressor and accumulator? anything else that should be replaced/checked? And no, the a/c doesn't work know, I believe I have either a big leak in the system or a bad low presser sensor, or something of that nature. I know that the system has to be put under vacuum to get rid of all the moisture, but Is that something that is better to have a shop do or could I pick up a little vacuum thingy and do it myself?
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Old July 21st, 2010, 10:12 AM   #2
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I figured i'd just post this in the general tech section, but this is for a 96 chevy silverado 1500

I need to replace the a/c compressor, the clutch is going bad, it will squeel every once in a while and if I turn the a/c on to engage the compressor. And I really want to have cold a/c in my truck, it'd be nice to have it's another good selling point should I decide to sell it

Anyway, my question is, what exactally do you have to do after replaceing the compressor and accumulator? anything else that should be replaced/checked? And no, the a/c doesn't work know, I believe I have either a big leak in the system or a bad low presser sensor, or something of that nature. I know that the system has to be put under vacuum to get rid of all the moisture, but Is that something that is better to have a shop do or could I pick up a little vacuum thingy and do it myself?
Depends on whether the clutch is squealing because the compressor is locked up or because the pulley bearings are bad (or a combination of both).

You'll need to determine if you have a charge in the system or not and proceed accordingly. Unless you're familiar with the process, the best results for reclaim/repair/evacuation/recharge would be obtained by taking it to a shop that has the proper equipment.
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Old July 21st, 2010, 10:50 AM   #3
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Check with Peter @ Eastwood Autoworks in your area.
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Old July 21st, 2010, 11:50 PM   #4
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Depends on whether the clutch is squealing because the compressor is locked up or because the pulley bearings are bad (or a combination of both).

You'll need to determine if you have a charge in the system or not and proceed accordingly. Unless you're familiar with the process, the best results for reclaim/repair/evacuation/recharge would be obtained by taking it to a shop that has the proper equipment.
I've tried charging it before, with a can of the artic freeze stuff, with the gague on it. It's never fully out, there's always at least 10-15psi in it or so. I've charged it to where it should be (about 50-55 psi, depending on ambient air temp) but the air never gets cold. An it's squeeing because the bearing are bad, the compressor will not be on and it will squeel, it sounds exactally like a bad clutch, when the compressor is on it wont make any noise, then when it shuts off, it will grind/squeel

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Check with Peter @ Eastwood Autoworks in your area.
Thanks for the refferal, i'll have to stop by. I've seen his ads in the alpena news, never thought much about it
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Old July 23rd, 2010, 11:53 AM   #5
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I've tried charging it before, with a can of the artic freeze stuff, with the gague on it. It's never fully out, there's always at least 10-15psi in it or so.
That doesn't mean the system has a refrigerant charge in it, only that it has some pressure (could be air) in it.

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I've charged it to where it should be (about 50-55 psi, depending on ambient air temp) but the air never gets cold.
I'll assume it's low side PSI you're talking about, which is too high. Either you're charging it without it running, or you've overcharged it (which will cause it no also not get cold).


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An it's squeeing because the bearing are bad, the compressor will not be on and it will squeel, it sounds exactally like a bad clutch, when the compressor is on it wont make any noise, then when it shuts off, it will grind/squeel
Replace the compressor pulley, the bearings are shot, but it sounds like you need a little more work done.
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Old July 23rd, 2010, 07:23 PM   #6
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I'll assume it's low side PSI you're talking about, which is too high. Either you're charging it without it running, or you've overcharged it (which will cause it no also not get cold).
Yea it was low side, the side that you fill using a standard refill can. I think it was 50 psi, but it was whatever the bottle said it should be. it listed different psi ratings depending on how hot/cold it was outside. I know that the gague on the refill can went up to 45 psi still in the green


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Replace the compressor pulley, the bearings are shot, but it sounds like you need a little more work done.
I know it needs more work than that lol I was hoping that I would be able to fix it myself, but I doubt it. There is a sticker that says it was treated with UV fluid stuff to detect leaks (about 3 years ago lol) I might take a black light to it and see if any spots light up that will show me where the leak is coming from

If it was overpressurized what can be done to fix that? Which from what you said very well may be the case
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Old July 26th, 2010, 12:53 PM   #7
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If it was overpressurized what can be done to fix that? Which from what you said very well may be the case
Let some out. Problem is that what you have in the system is most likely a mixture of air and R134. Even with the system at "proper charge" (pressure-wise), if there is air in there then it will not function properly.
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