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Join Date: Dec 2002
Location: Dahlonega , Georgia
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What am I doing wrong-AC problems
I have removed and replaced all hoses and I added a underbelly condensor and quarter panel condensor with fan and retained the front OEM condensor and fan.Also replaced the receiver/drier and expansion valve.I filled 3 cans of HC12A about 3 weeks ago and it cooled great.I lost the charge do to a leak at the hoses leading to the expansion valve so I fixed that useing copper sealing washers,pulled a vacuum for 2 hours and left it overnight to make sure no leaks and there weren't any so I added 2 cans of refrigerant and nothing,my low side pressures are 70 to 80 and my high side are about 60,do I have a bad expansion valve?I am really pissed right now as I have been working on this since Christmas and it's starting to warm up here,please any ideas are wanted.The car is a 83SC with a Sanden compressor.Thanks
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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03-22-2005, 02:13 PM
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Now I feel like I am in a Twilight Zone episode.After writing my original post I called Charles Fox at Fox Tool and Supply where I purchased my HC12A from and he had a couple of ideas but also suggested just drive the car and the AC will start working so I hopped in the car,turned on the AC and started driving,within 2 minutes the cold air started pouring out of the vents!!! It appears to be working fine,very strange.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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03-22-2005, 03:50 PM
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Did Fox tell you why it would start working?
What kind of temps are you getting?
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03-22-2005, 03:58 PM
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I haven't tested the temps with a gauge but it sure feels good.As far as why Fox thought it might start working is apparently the HC12A is thinner/lighter than R12 or R134A,because of this he thought it might take a little while for the expansion valve to start working correctly.At this point I am just going to monitor the temps and hope I have this done so I can move on.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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03-22-2005, 04:25 PM
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Location: Los Alamos, NM, USA
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Was the compressor really running (clutch engaged not just the belt turning) when you read those pressures: 70 to 80 psi low side and 60 psi high side? What type of oil do you have in the compressor? Jim
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03-22-2005, 04:25 PM
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Yes Jim the compressor was running.The oil I am useing is mineral oil for R12.I am going to drive the car to work tomorrow and when I get home will hook the gauges back up and see what kinds of pressures I get with it apparently working.I expect around 30 on the low side and 100 to 125 on the high.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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03-22-2005, 04:37 PM
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do you have a high/low pressure cut-off switch in the system?
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03-22-2005, 04:38 PM
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There is one in the drier but I haven't wired it in yet.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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03-22-2005, 04:46 PM
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Remember, lower low side pressure equates to lower vent temp.
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03-22-2005, 06:48 PM
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Unconstitutional Patriot
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Quote:
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03-22-2005, 06:51 PM
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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
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fuerst, are you using an expansion valve for R12? Those pressures are whacked.
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03-22-2005, 06:54 PM
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Yes a expansion valve for R12.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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03-23-2005, 02:09 AM
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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
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When head pressures are less than suction pressure, it may be a restriction in the expansion valve (piece of trash or debris in the valve) or any restriction from the expansion valve to the compressor (like a kinked piece of tubing).
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03-23-2005, 02:50 PM
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