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Old 05-05-2012, 02:24 PM   #1
WRXbrian
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Member#: 165307
Join Date: Nov 2007
Chapter/Region: South East
Location: FLA
Default a/c guru input needed

ok, so i understand a good amount of a/c work. I am trying to narrow down my problem, and input is welcome.


ok, so I had my H a/c line blow out (next to the valve, pressed fitting from hose to metal) not thinking anything of it bought a new line with o-rings and replaced it.

grabbed a can of R154 with oil and a few regular cans of R154, sucked down the system to about 30PSI and began charge. about 12OZ in i notice every time the compressor cycles it pushes the L side to 0PSI and sometimes even into vaccum? i continuously let it cycle with no bettering results

while at the same time, H side is about 275-300PSI (in FL 90 heat) i applied water to the condenser and it reached 200-225PSI. i checked the valve in the fitting, couldn't see any issues and it is new. from what i grasp there is a block in the system somewhere. I don't see where a drier would commit such a large block in the system, as the system was not left open.

my thoughts only could be the expansion valve inside the vehicle?
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Old 05-05-2012, 08:21 PM   #2
Elbert Bass
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Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: South East TN
Vehicle:
1995 Chevy S-10
White

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You are seeing the reason why that hose blew - you have a blockage. Yes, the likely culprit is the expansion valve. Since your profile is incomplete - no model specific info is forthcoming. If you can get to the expansion valve you can try tapping it with a plastic hammer to see if you can cause it to open to confirm that is the fault (don't hit the part that looks like a funny hat). Otherwise you can recover the R134 and test the lines and components external of the compressor with nitrogen until you find the blockage. Or you can just put an expansion valve on.
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Old 05-05-2012, 09:40 PM   #3
WRXbrian
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Join Date: Nov 2007
Chapter/Region: South East
Location: FLA
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Thanks! I knew it was a confirmed blockage, just wasn't sure if I were overlooking something. I will have to find a diagram for it, fiddle with it and possibly replace. I knew the expansion valves purpose, just was unsure if it can make such a large block.
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Old 05-08-2012, 11:57 PM   #4
Kingnothing616
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Join Date: Mar 2011
Chapter/Region: TXIC
Location: Tyler, TX
Vehicle:
2011 WRX
Red

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When you remove the expansion valve you need to find out what blocked it. If there are any metal shavings, your compressor may be coming apart. 9/10 at work when we see an a/c system blockage the compressor decided to grenade. Every now and then its just the insides of the rubber hoses breaking down.
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