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Schrader valve or what?

Poot on Tue March 10, 2009 6:23 PM User is offline

Year: 1999
Make: gmc
Model: sierra
Engine Size: 5.3
Refrigerant Type: 134A
Ambient Temp: 76
Pressure Low: d/k
Pressure High: d/k
Country of Origin: United States

Text Two years ago I had the compressor replaced (new) and it's worked great until yesterday. It cycled on and off so when I got home I checked and found oil around a valve on the high side line.
Close to the firewall there's a schrader valve then maybe a foot towards the front there's another and that's the one leaking.
Removed it's cap and there's a black rubber "flap" down in it and freon was escaping from it. Since there's already a valve in the same line inches apart, what the heck is the purpose of this second one....besides another place for a leak to happen.
It's screwed into the metal line (and hopefully will come out easily) but what's it called? Can it be replaced with a TRUE schrader valve? Is there someplace online where I can buy a replacement? We live in a rural area and it's a good drive to any dealership that would carry whatever this is called.
Another thing is I've looked and looked but cannot find the low side valve. I followed the low side hose from firewall to compressor, felt all over the compressor, and around on the receiver/dryer but can't find one.
Anyone with an idea of where it would be located?
Thanks in advance

bright41 on Tue March 10, 2009 7:12 PM User is offlineView users profile

you have a low pressare side and a high pressear side there both need for testing of your air contioning system to tell if its low on r-134a and its your only window in knowing what your ac system is doing so it sounds like your going to have to go into a repair shop and have them replace the high side line and vacuam and recrhage your air condining system unless you have the time and the tools to do it right

Chick on Tue March 10, 2009 9:41 PM User is offlineView users profile

Look for a crimp between the two shrader valves,(service ports) the O tube is in between making the one closer the firewall the low side and the other the high side. The high side is a replaceable service port, the system must be empty before replacing it, then the system vacuumed and recharged to factory specs. you can e-mail the guys at Ackits.com for a replacement service port.. Hope this helps..



High side service port

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

TRB on Tue March 10, 2009 9:44 PM User is offlineView users profile

Already looking it up my friend.

35-50021

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com


Edited: Tue March 10, 2009 at 9:45 PM by TRB

Poot on Tue March 10, 2009 11:47 PM User is offline

Thanks for the replies and ideas but here's the thing. Both of these service valves are in the HIGH pressure side/smaller aluminum tube. One has the schrader core and the other has the rubber piece inside that's leaking but again, both are in the same line 7" apart. The high side comes out of the firewall, turns 90 towards the passenger side and that's where the schrader port is, then another 90 toards the front and there's the second one with the rubber piece inside.
The low pressure side (larger rubber hose) runs from the compressor to the receiver/dryer but there is no valve in sight. I'm not a/c tech by trade nor am I an expert by any stretch but I've done my share of a/c work in the past and have the R12/R22 and 134A manifolds, vacuum pump, wrenches, etc, but I've never run across one where I couldn't find a low side service port. By the same token I've not run across this seemingly pointless valve with the rubber flap or whatever it is inside of it instead of the typical screw-in core.

Chick on Wed March 11, 2009 7:07 AM User is offlineView users profile

The line goes from high pressure to low pressure due to the O tube (expansion device) being in between the two service ports. There should be a fitting in between the two ports, so you can remove and check the O tube before recharging it.. hope this helps.. BTW, the high side is the replacable port, should be a standard srader valve in the low side port..

Below is a pic of what it sounds line, It's from an Olds aurora, same principal:



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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Poot on Wed March 11, 2009 3:31 PM User is offline

Text
Thanks for the pic and info. I awoke this morning, the light finally came on, and I realized what you were saying! Both the low/high side ports are in the same line which I've not seen before but it's been awhile since I've serviced one. Mi wife has a 99 Old's mini van, I a 95 Impala, and a 95 Kia, and all those have valves in seperate lines, one in the high, one in the low. When I awoke I thought "They're both in the same line but seperated via that crimp."
But mine doesn't have that screw together fitting between the valves as you showed in the pic. It's nothing but a solid aluminum line with the two valves about 7" apart and the only thing between them is the crimped spot.
Oh, anyplace online that you know of that sells a replacement high side valve? I a little afraid to try to take it out because of the posibility of breaking the line. Using two wrenches I tried yesterday but it gave no sign whatsoever of breaking loose. Maybe just a new cap?????? Thanks again!!!!!!!!!
Poot

bohica2xo on Wed March 11, 2009 4:12 PM User is offline

That line will need to be replaced to replace the orifice tube anyway. The replacment line has the joint to allow the replacment of just the orifice tube.



AC Delco part online is less than 70 bucks, you can find that part for as little as 50 in some places.

Just replace the whole line, it is time (10 years) for an OT anyway.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Poot on Thu March 12, 2009 3:30 PM User is offline

Quote
Originally posted by: bohica2xo
That line will need to be replaced to replace the orifice tube anyway. The replacment line has the joint to allow the replacment of just the orifice tube.
AC Delco part online is less than 70 bucks, you can find that part for as little as 50 in some places.
Just replace the whole line, it is time (10 years) for an OT anyway.


Thanks for the info and pic and that's exactly how mine looks, minus that joint. That bothers me somewhat because when I had the compressor/receiver/dryer replaced maybe two years ago they didn't change that line or even mention it. What I've gathered from you is the orfice filter can't be replaced unless a new/improved line is used because of the fitting it has that mine doesn't. Right? Or am I'm misunderstanding?
I know what and where the orfice filter is and typically I use slender needle nose (or a small hooked wire depending) pull it out but maybe on this truck it's down in that tube and can't be reached to change, hence the improved replacement? And to ease anyones thoughts, I didn't replace the compressor and all myself because a health issue prevents my doing things like this anymore, but thankfully I can still service it when needed.

Chick on Thu March 12, 2009 4:34 PM User is offlineView users profile

Yes, the O tube is in the middle of those service ports. GM does it again... You will need to buy both sections of line and an O tube and replace the one piece line..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Poot on Sat March 21, 2009 3:42 AM User is offline

Thank you sir and yep, GM strickes again. Must be an X Ford engineer working there now. Hee hee hee.Text

Poot on Sat March 21, 2009 3:49 AM User is offline

Thanks for the part number. Do you offer the protective caps for the service valves?

TRB on Sat March 21, 2009 2:24 PM User is offlineView users profile

Item # CP0136, (16MM R134A HIGH VALVE PORT) $ 2.94 plus freight.

Not listed on website but will be added Monday along with the blue low side caps.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

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