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#4510738 - 09/08/17 10:27 AM Accidentally depressurized the A/C
zorobabel Offline


Registered: 01/27/11
Posts: 478
Loc: Anaheim, CA
I was trying to remove the AC pulley from the 97 Maxima, hoping to replace the pulley bearing.
I removed the bolt holding the clutch plate and the clutch plate itself.
Then I removed the first snap ring.
Then I made a boo-boo and removed another snap ring

and then a vapor and yellow oil blew in my in face. I jumped out of the way, scraping my elbow and leg on the pavement and rushed into the bathroom to wash my self and my eyes.
I return to the car, the spraying had stopped by now and I see the results:





It looks like I depressurized the AC by removing some kind of seal. I have to stop doing all but the most simple tasks while it's hot, I can't think straight or concentrate in such discomfort.

After about 20 minutes, I got my head together and I reinstalled the seal and the snap ring, then installed the clutch plate back so that seal part stays clean.
Please see photo for compressor model.


I unplugged the compressor electrical connector and installed a 36" serpentine belt to bypass the A/C. I have been driving the car like this for 2 days.
I do want to fix the A/C though. Any pointers?
The bearing seems to be a NSK 928 40bd219duk.
_________________________
1997 Maxima 175k, Delvac 15w40, Wix 51315
2004 Corolla 189k, VWB 5w20 + SSS 10w40, MGL4967

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#4510743 - 09/08/17 10:31 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
dishdude Online   content


Registered: 11/14/08
Posts: 8751
Loc: Phoenix
Hmm, You might need a new compressor.
_________________________
2018 Challenger SRT

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#4510747 - 09/08/17 10:36 AM Re: Accidentally depressurized the A/C [Re: dishdude]
Reddy45 Offline


Registered: 08/15/08
Posts: 2968
Loc: USA
Originally Posted By: dishdude
Hmm, You might need a new compressor.


Seems a bit extreme? Why not just recharge the system and add the right amount of compressor oil?

All of these systems were dry at one point and had to be charged. A system that has been vented is not inherently broken right?

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#4510761 - 09/08/17 10:54 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
AandPDan Offline


Registered: 02/01/11
Posts: 898
Loc: MA
Originally Posted By: zorobabel

I do want to fix the A/C though. Any pointers?


The system will need to be pumped down, evacuated of all air and moisture.

Take it to someone that can do this and charge it by weight.

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#4510762 - 09/08/17 10:55 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
spackard Offline


Registered: 03/24/11
Posts: 1714
Loc: CA
Replace the oil that got blown out. Hard to say how many oz that is though.
If you don't, the compressor will seize.

Also, be aware that refrigerant seals and O-rings are harmed by ordinary engine oils. It's a different system, treat it with respect. I don't know if you'll get away with reusing the seal.

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#4510766 - 09/08/17 10:57 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
MarkM66 Offline


Registered: 10/19/10
Posts: 1544
Loc: stl
Why didn't you just install the new bearing? Install it, and have the system vac'd and recharged.

I wouldn't beat yourself up over it.

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#4510778 - 09/08/17 11:15 AM Re: Accidentally depressurized the A/C [Re: MarkM66]
Canadastang Offline


Registered: 12/08/15
Posts: 261
Loc: Ontario Canada
Chalk it up to experience. At least you weren't injured in the process.

+1 get the system vacuumed and recharged. It's probably going to need some PAG oil too.

Definitely tell the shop what happened so they can check for leaks around that area just in case.

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#4510780 - 09/08/17 11:17 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
SnowDrifter Offline


Registered: 08/24/14
Posts: 391
Loc: WA
An evac and recharge is easy. I do mine at home with a vac-pump, scale, and a set of manifold gauges. I think the more difficult part here would be determining how much oil was lost as you'll need to replenish it

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#4510789 - 09/08/17 11:27 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
mehullica Offline


Registered: 08/19/09
Posts: 554
Loc: Modesto,CA
I'd pull the compressor, drain all the oil out, replace the seal, bearing & 2 hose Orings. Reinstall & put in the correct oil level. If you have a friendly Nissan dealer, they can tell you how much oil to put into a dry compressor from the repair manual. You don't want to guess how much oil to add in a situation like this

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#4510800 - 09/08/17 11:42 AM Re: Accidentally depressurized the A/C [Re: zorobabel]
nthach Offline


Registered: 01/02/04
Posts: 3898
Loc: California
You took out the shaft seal, and careful practice needs to be exercised, one nick from the shaft splines can take out the seal.

ACKits online stocks repair kits for those compressors as well as the shaft seal and installation tool, although you can wrap the splines in electrical tape and very slowly and carefully walk it over and drive it home. The hard part is getting a bearing. Evac and recharge the system, add enough oil to compensate for a new compressor, minus the amount in the drier, evap and condenser - should be an underhood label with the total amount, I think it's .5oz for the drier and 1oz for evap/condenser that have to be subtracted from total fill. Check the repair manual for the oil balancing procedure.

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#4510841 - 09/08/17 12:40 PM Re: Accidentally depressurized the A/C [Re: zorobabel]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
Those seals are hard enough to make seal when new. I doubt it will seal again. Plan on a new compressor.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4510872 - 09/08/17 01:21 PM Re: Accidentally depressurized the A/C [Re: zorobabel]
Boosted240 Offline


Registered: 07/06/09
Posts: 20
Loc: Canada
If you can get the bearing, go ahead and replace it if able. Same with the seal if you can get one. Then go get the system recharged, they will apply vacuum and test for leaks first. Your AC clutch will also not engage is there isn't enough refrigerant pressure in the system so no need to disconnect the connector or belt.


Edited by Boosted240 (09/08/17 01:23 PM)

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#4510897 - 09/08/17 01:57 PM Re: Accidentally depressurized the A/C [Re: zorobabel]
michaelluscher Offline


Registered: 10/07/12
Posts: 2420
Loc: Staten Island, NY
I've made a similar mistake when doing A/C work, with a sticky Schrader valve

You were wearing your safety squints? Right?

Might want to get those eyes checked

Back to the problem at hand

My past luck with compressor repair isn't great, short of pulley swapping

I'd prepare the $210-$245 for a new compressor, add in a receiver/dryer for good measure

Evac and charge as usual
_________________________
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'13 Chrysler 300 3.6 Pentastar 230k

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#4510942 - 09/08/17 02:55 PM Re: Accidentally depressurized the A/C [Re: zorobabel]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
6.8 ounces compressor oil entire system
2.5 ounces compressor oil for evaporator replacement
2.5 ounces compressor oil for condenser replacement

Compressor oil PAG Type-S Nissan part# KLH00-PAGS0

1.43 (+/- 0.11) pounds system capacity of refrigerant R143a

Doesn't tell you the specific oil capacity for the compressor itself. Says to measure oil drained from old compressor. If I had to guess I'd say about 3 ounces.

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#4510947 - 09/08/17 03:04 PM Re: Accidentally depressurized the A/C [Re: zorobabel]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
I would add back 2oz if you replace the seal instead of a new compressor
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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