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Old 03-27-2012, 07:10 AM   #1
Scooby Newbie
Member#: 311801
Join Date: Feb 2012
Chapter/Region: NWIC
Location: Portland OR
Default Loud knocking from A/C compressor.. 1990 Legacy

So, the A/C was completely dead on this thing. It wouldn't even come on, then I found the charge was completely gone.

I pulled a vacuum, found that it was leaking at schrader valves. Replaced shrader.

Pulled a vacuum again, charged with 850g of refrigerant 12 (spec calls 800-900g)

Now the compressor comes on but the input and output are both hot and neither pipe is getting cold. It also makes a horrendous knocking sound, like an MRI machine.

I need to hookup gauges, but I don't have the high side fitting for R12, but even then something is seriously screwed. What a freaking waste of two pounds of R12.
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Old 03-27-2012, 10:22 AM   #2
Scooby Specialist
Member#: 198067
Join Date: Dec 2008
Chapter/Region: Tri-State
Location: RAMSEY, NJ
2009 IMPREZA 2.5i 4d
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If your going to do major work on the A/C system, change to R143a.
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Old 03-27-2012, 11:10 AM   #3
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Member#: 119934
Join Date: Jul 2006
Chapter/Region: TXIC
Location: DFW
2015 WRX Limited


^ He meant 134a
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