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
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
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
Already looking it up my friend.
35-50021
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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.
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
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
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.
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
Thank you sir and yep, GM strickes again. Must be an X Ford engineer working there now. Hee hee hee.Text
Thanks for the part number. Do you offer the protective caps for the service valves?
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.
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