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A/C Fitting Leaking Oil #4470877
07/26/17 11:18 AM
07/26/17 11:18 AM
Joined: Aug 2004
Posts: 1,364
VA
Rhymingmechanic Offline OP
Rhymingmechanic  Offline OP
Joined: Aug 2004
Posts: 1,364
VA
2001 Chevy Silverado. I had the hood open yesterday and noticed oil on the line in the first photo. It seemed to be coming from the valve under the nearest black cap. I took off the cap today after a drive and saw clear oil bubbling out of the valve. The liquid puddled on the inner fender in photo 2 is condensation, but a little oil seems to have gotten down there as well. The A/C system has never been worked on, and I haven't noticed any recent changes in cooling performance (yet). I have three questions: First, what is this part called? Second, can I fix it with a new part and a wrench, or will the refrigerant leak out? In that case, I would need to take it to somebody with the right equipment. If it comes to that, what will the job include? Thanks in advance--a lot of you have a lot more experience and know-how with A/C than I do.

Re: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4470883
07/26/17 11:24 AM
07/26/17 11:24 AM
Joined: Dec 2015
Posts: 261
Ontario Canada
Canadastang Offline
Canadastang  Offline
Joined: Dec 2015
Posts: 261
Ontario Canada
The schrader valve can be replaced quite easily...but you'll need to evacuate the system first and then recharge it.

If you deal with a good shop, have them check over the whole system for leaks, then evacuate it, replace the valve and whatever else is leaking and have it vacuumed, then recharged.

Shouldn't be too expensive.

Re: A/C Fitting Leaking Oil [Re: Canadastang] #4470898
07/26/17 11:32 AM
07/26/17 11:32 AM
Joined: Feb 2009
Posts: 8,776
Texas
440Magnum Offline
440Magnum  Offline
Joined: Feb 2009
Posts: 8,776
Texas
Originally Posted By: Canadastang
The schrader valve can be replaced quite easily...but you'll need to evacuate the system first and then recharge it.

If you deal with a good shop, have them check over the whole system for leaks, then evacuate it, replace the valve and whatever else is leaking and have it vacuumed, then recharged.

Shouldn't be too expensive.


Likely what he said... but I would first get a schrader valve tool and simply try tightening the valve. It might be leaking around the valve rather than through the valve, and that could save you a lot of headache!

https://shop.advanceautoparts.com/p/milt...ECABEgJ5qvD_BwE


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Re: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4470900
07/26/17 11:32 AM
07/26/17 11:32 AM
Joined: Oct 2010
Posts: 1,574
stl
MarkM66 Offline
MarkM66  Offline
Joined: Oct 2010
Posts: 1,574
stl
You can replace the schrader valve without loosing refrigerant. Just need the tool to do so.

https://www.amazon.com/Robinair-18560-Va...ve+removal+tool

https://www.youtube.com/watch?v=ES0NFPH4eJg

Re: A/C Fitting Leaking Oil [Re: MarkM66] #4470945
07/26/17 12:05 PM
07/26/17 12:05 PM
Joined: Apr 2017
Posts: 429
Utah, USA
28oz Offline
28oz  Offline
Joined: Apr 2017
Posts: 429
Utah, USA
Originally Posted By: MarkM66
You can replace the schrader valve without loosing refrigerant. Just need the tool to do so.

https://www.amazon.com/Robinair-18560-Va...ve+removal+tool

https://www.youtube.com/watch?v=ES0NFPH4eJg


What a clever tool! Thanks for sharing that!


-----------------
1990 Nissan 300zx - Castrol Edge Euro 0W-40
2004 Nissan Quest - Pennzoil Platinum Euro 0W-40
2003 Ford Excursion 7.3 PSD - Mobil 1 TDT 5w-40
Re: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4470988
07/26/17 12:39 PM
07/26/17 12:39 PM
Joined: Apr 2016
Posts: 753
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline
Joined: Apr 2016
Posts: 753
Specific Ocean
The high side does not use a schrader valve. It uses a ball type valve where you need to replace the whole fitting if it leaks. Bring it to a shop and have them change it out since the refrigerant needs to be evac'd. Have them change out the low side schrader valve too.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L - 170k mi
02 Chevy Silverado C1500 V8 5.3L 154k mi
Re: A/C Fitting Leaking Oil [Re: Kibitoshin] #4470991
07/26/17 12:41 PM
07/26/17 12:41 PM
Joined: Dec 2005
Posts: 651
Virginia
cpayne5 Offline
cpayne5  Offline
Joined: Dec 2005
Posts: 651
Virginia
Originally Posted By: Kibitoshin
The high side does not use a schrader valve. It uses a ball type valve where you need to replace the whole fitting if it leaks. Bring it to a shop and have them change it out since the refrigerant needs to be evac'd. Have them change out the low side schrader valve too.


Yep, the fitting needs to be replaced.
https://www.napaonline.com/en/p/NDP7305607

Re: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4470997
07/26/17 12:56 PM
07/26/17 12:56 PM
Joined: Aug 2004
Posts: 1,364
VA
Rhymingmechanic Offline OP
Rhymingmechanic  Offline OP
Joined: Aug 2004
Posts: 1,364
VA
Thanks for the replies so far. I expected to see a schrader valve under that cap--But there's actually just what looks like a piece of rubber. The back fitting does have a schrader, but not this one. Another video on the page MarkM66 linked shows somebody repairing the back valve on a Silverado.

Could there be a schrader valve under the fitting in my second photo? *EDIT* The last 2 posts came in while I was typing. Thanks for clarifying.

Last edited by Rhymingmechanic; 07/26/17 12:57 PM.
Re: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4471018
07/26/17 01:22 PM
07/26/17 01:22 PM
Joined: Dec 2005
Posts: 651
Virginia
cpayne5 Offline
cpayne5  Offline
Joined: Dec 2005
Posts: 651
Virginia
Just for reference, that rear fitting is the low side service port and the one leaking is the high side service port. Between the high side and where those two pipes come together (nuts) is where your orifice tube is located.

Last edited by cpayne5; 07/26/17 01:22 PM.
Re: A/C Fitting Leaking Oil [Re: Kibitoshin] #4471039
07/26/17 01:39 PM
07/26/17 01:39 PM
Joined: Dec 2016
Posts: 6,239
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,239
Waco, TX
Originally Posted By: Kibitoshin
The high side does not use a schrader valve. It uses a ball type valve where you need to replace the whole fitting if it leaks. Bring it to a shop and have them change it out since the refrigerant needs to be evac'd. Have them change out the low side schrader valve too.


Agreed....

being the truck is 15+ years old,
there may be other things that should be replaced when the system is opened.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: A/C Fitting Leaking Oil [Re: cpayne5] #4471041
07/26/17 01:40 PM
07/26/17 01:40 PM
Joined: Dec 2016
Posts: 6,239
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,239
Waco, TX
Originally Posted By: cpayne5
Just for reference, that rear fitting is the low side service port and the one leaking is the high side service port. Between the high side and where those two pipes come together (nuts) is where your orifice tube is located.


The "crimps" in the line is a dead giveaway smile


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4471151
07/26/17 04:01 PM
07/26/17 04:01 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
That is a high side charge port. It does NOT use a regular schrader valve. You must discharge the ac and replace the whole valve. I will post a pic when I find it.


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: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4471152
07/26/17 04:03 PM
07/26/17 04:03 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
Cpayne5 beat me to it.


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: A/C Fitting Leaking Oil [Re: Rhymingmechanic] #4471168
07/26/17 04:28 PM
07/26/17 04:28 PM
Joined: May 2014
Posts: 3,667
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline
Joined: May 2014
Posts: 3,667
Columbus,Nebraska
That looks like the high pressure liquid line to me. The low pressure vapor line is the hose going to the condenser. ??

Re: A/C Fitting Leaking Oil [Re: Yah-Tah-Hey] #4471195
07/26/17 04:52 PM
07/26/17 04:52 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
Originally Posted By: HosteenJorje
That looks like the high pressure liquid line to me. The low pressure vapor line is the hose going to the condenser. ??
you got it backwards


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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