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#16
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Are you sure? As I had to pull the dash in our Legacy...
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Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#17
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I'll chime in here. I asked my son how bad of a job it was going to be, and he told me too, that the dash can stay in, just the glove box assy comes out. It sounds like a tight job to do, but not as bad as others.
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#18
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Once you evacuate then disconnect the 2 pipes going through the firewall the entire unit comes out as an assembly. It would be a very good idea to clean it out while it's out. Yucky!
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#19
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a/c not working
So, I've replaced the compresser and dryer, repaired a hose, vacuumed the system out and it held for an hour. Put in 2 cans of r134. The compresser cycled repeatedly for short periods. Low pressure was off the gauge (all the way past the top number). I let out pressure a little at a time until the compressor runs consistently. The big line running back toward the fire wall is still warm, but in 96 degree weather it blows cool air. A simple gauge shows the pressure, with the compressor running, as "low", no freon is visible flowing in the site glass of the dryer.
Does this make it a expansion valve problem, a condensor blockage, a weak compressor, all the above? Any advice would be appreciated. BTW, the a/c hasn't worked for two years, but through persistence I'm up to "cool". Seems it should be "cold". David |
#20
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Roughgem, have you cleaned out the condenser? A lot of times this problem is due to inadequate airflow to cool the R134. It should blow cold enough that it's freezing your hands on the steering wheel
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#21
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a.c expansion valve
No I did not. Is it possible to blow compressed air backward through it? Say, from drivers side back toward the passengers side. I've really tried to do most of my own work, but at some point it may be futile. Thanks for your response.
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#22
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Added/edited for clarification: Fact of life: you can't blow what you can't suck. Stuck TXV will cause 10-15" vacuum on low side and since there isn't anything available to the compressor to compress the high side will usually only rise about 10-15lbs. above static. On systems with low pressure cycling switch the compressor may shut down, as the system is cycling off to thwart evaporator freezing. This is normally found on orifice tube based systems. Typically TXV based systems don't worry about too-low pressure, but there are always exceptions. So, as I stated above, a stuck closed TXV can lower pressure to the point a low-pressure switch will open the compressor circuit BUT it is not a normal control device as such and the compressor will continue cycling as pressure equalization repeatedly occurs during the off periods. You may think I'm picking nits but I feel it is important to be clear, especially here, as there seems to be some difficulty in properly diagnosing the problem. Quote:
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) Last edited by Beav; 07-20-2006 at 10:51 AM. |
#23
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I remember you mentioned you had high pressure in the low side and low pressure on the high side. I did some research through my AC books and found; the cause of high pressure on the low side is the expansion valve is stuck in the open position. The cause of low pressure on the high side is a defective discharge valve in the compressor. Hope this helps with your problem.
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#24
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Well we'll know shortly. Since compressor was replaced with no change, we ordered and recieved one of the last 4 expansion valves in the country from SOA. Son is planning on installing this weekend then take into work to recharge system. Speaking with him just today, if this doesn't fix it...I may just have to learn to not have A.C. in the hot weather. Somtimes you just don't want to give up though!
I will let you all know in this post how it turns out. Scott BTW. there is a guy here in Omaha with a Black 1997 SVX he is planning on selling if anyone is interested. I can pass on his email. |
#25
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YEA!
A/C finally works blows 47deg. air! the expansion valve fixed the problem. I tell you what, its amazing what crap can find its way to the evaparator case. It was good to get it pulled out and cleaned up as well. Again, lucky for me to have an "inhouse" Subaru tech to work on such a complicated car. Scott/Omaha |
#26
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Glad you got it working Scott!
I guess I need to tear into mine now
__________________
Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#27
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expansion valve
Well..... I've removed the unit under the dash and cleaned out the core area. I've dismantled the brass assembly which I believe is the expansion valve. After removing the inner nut and spring assembly I'm able to blow air through the body of the brass assembly both ways. Would this constitute an open valve? Or is the ability to blow air through the assembly not right. (My original problem was high pressure on low side with no cooling through the core. The tube running into the dryer would be cold so I assume the restriction at the dryer acted as an expansion valve of sorts.)
Any help would be appreciated. David |
#28
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High pressure on the low side indicates the expansion valve is either stuck open or too much refrigerant is being feed due to a defective expansion valve. Your best bet is to replace it while it's out.
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