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Accidentally depressurized the A/C #4510738
09/08/17 10:27 AM
09/08/17 10:27 AM
Joined: Jan 2011
Posts: 561
Anaheim, CA
zorobabel Offline OP
zorobabel  Offline OP
Joined: Jan 2011
Posts: 561
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 181k, Edge 10w30, K&N HP-1003
2004 Corolla 191k, VWB 5w20 + SSS 10w40, MGL4967
Re: Accidentally depressurized the A/C [Re: zorobabel] #4510743
09/08/17 10:31 AM
09/08/17 10:31 AM
Joined: Nov 2008
Posts: 9,044
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,044
Phoenix
Hmm, You might need a new compressor.


2018 Challenger SRT
Re: Accidentally depressurized the A/C [Re: dishdude] #4510747
09/08/17 10:36 AM
09/08/17 10:36 AM
Joined: Aug 2008
Posts: 3,162
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,162
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?

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510761
09/08/17 10:54 AM
09/08/17 10:54 AM
Joined: Feb 2011
Posts: 904
MA
AandPDan Offline
AandPDan  Offline
Joined: Feb 2011
Posts: 904
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.

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510762
09/08/17 10:55 AM
09/08/17 10:55 AM
Joined: Mar 2011
Posts: 1,811
CA
spackard Offline
spackard  Offline
Joined: Mar 2011
Posts: 1,811
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.

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510766
09/08/17 10:57 AM
09/08/17 10:57 AM
Joined: Oct 2010
Posts: 1,574
stl
MarkM66 Offline
MarkM66  Offline
Joined: Oct 2010
Posts: 1,574
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.

Re: Accidentally depressurized the A/C [Re: MarkM66] #4510778
09/08/17 11:15 AM
09/08/17 11:15 AM
Joined: Dec 2015
Posts: 261
Ontario Canada
Canadastang Offline
Canadastang  Offline
Joined: Dec 2015
Posts: 261
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.

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510780
09/08/17 11:17 AM
09/08/17 11:17 AM
Joined: Aug 2014
Posts: 513
WA
SnowDrifter Offline
SnowDrifter  Offline
Joined: Aug 2014
Posts: 513
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


2005 Tahoe - 135k
2003 Forester(the swagger wagon) - Rehomed
1999 Passat - Rehomed
Re: Accidentally depressurized the A/C [Re: zorobabel] #4510789
09/08/17 11:27 AM
09/08/17 11:27 AM
Joined: Aug 2009
Posts: 575
Modesto,CA
mehullica Offline
mehullica  Offline
Joined: Aug 2009
Posts: 575
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

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510800
09/08/17 11:42 AM
09/08/17 11:42 AM
Joined: Jan 2004
Posts: 4,155
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,155
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.

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510841
09/08/17 12:40 PM
09/08/17 12:40 PM
Joined: Jun 2003
Posts: 17,355
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,355
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
Re: Accidentally depressurized the A/C [Re: zorobabel] #4510872
09/08/17 01:21 PM
09/08/17 01:21 PM
Joined: Jul 2009
Posts: 20
Canada
Boosted240 Offline
Boosted240  Offline
Joined: Jul 2009
Posts: 20
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.

Last edited by Boosted240; 09/08/17 01:23 PM.
Re: Accidentally depressurized the A/C [Re: zorobabel] #4510897
09/08/17 01:57 PM
09/08/17 01:57 PM
Joined: Oct 2012
Posts: 2,464
Staten Island, NY
michaelluscher Offline
michaelluscher  Offline
Joined: Oct 2012
Posts: 2,464
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


'06 Toyota Camry SE V6 3MZ-FE 100k
'01 Mercury Villager Estate VG33E 52k
'06 Ford Taurus SE Vulcan 60k
'13 Chrysler 300 3.6 Pentastar 230k
Re: Accidentally depressurized the A/C [Re: zorobabel] #4510942
09/08/17 02:55 PM
09/08/17 02:55 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.

Re: Accidentally depressurized the A/C [Re: zorobabel] #4510947
09/08/17 03:04 PM
09/08/17 03:04 PM
Joined: Jun 2003
Posts: 17,355
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,355
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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