A/C system refresh/rebuild - suggestions?
06-06-2014, 10:12 PM
#31
Burning Brakes
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Conclusion
Using the Century Auto rebuild kit for the 6E171 series compressor installed in the S3 I was able to remove, rebuild and reinstall the compressor. Following this procedure I was able to pull a -27mgHg vacuum on the system and it held for 30 minutes.
I required a few special tools to accomplish this feat. Large snap ring pliers are required to disassemble the compressor, they aren't all that special but get a good pair. I used a Channellock 927 8-Inch Retaining Ring Plier for the job.
Next you'll need a very specialized tool, the "MILLER TOOL C-4561 A/C COMPRESSOR HUB & DRIVE CLUTCH PLATE REMOVER". Don't think you can pull the clutch on these things with a gear puller; you can't. Buy this tool or you won't re-build this compressor. Seriously.
I then re-charged the system using R-12 after filling the re-built compressor with 8 oz. of Dyester oil (a blend of mineral oil and PAG compatible with R-12 and including a fluorescing additive.)
Reaching the High and Low pressure ports on the '85 928 can be difficult. Even locating them can be difficult. See https://rennlist.com/forums/928-foru...some-help.html for photos. Getting to the high pressure port on my car required removing the electric fan guard/shroud in front of the condenser.
I had difficulty getting the compressor to turn. This worked out to be an intermittent connection between the compressor and A/C Compressor relay at the first spade connection in the engine bay, between the compressor and the main wiring harness at the front of the block, (in front of the timing belt cover and behind the main belt driven fan). A shot of De-Oxit, followed by re-seating the connector cleared the problem.
Thanks to everyone for their help. The A/C now operates correctly, holds vacuum and blows cold air.
Today was a good day.
Regards,
Scott.
EPA Section 609 Certified Mobile A/C Technician
I required a few special tools to accomplish this feat. Large snap ring pliers are required to disassemble the compressor, they aren't all that special but get a good pair. I used a Channellock 927 8-Inch Retaining Ring Plier for the job.
Next you'll need a very specialized tool, the "MILLER TOOL C-4561 A/C COMPRESSOR HUB & DRIVE CLUTCH PLATE REMOVER". Don't think you can pull the clutch on these things with a gear puller; you can't. Buy this tool or you won't re-build this compressor. Seriously.
I then re-charged the system using R-12 after filling the re-built compressor with 8 oz. of Dyester oil (a blend of mineral oil and PAG compatible with R-12 and including a fluorescing additive.)
Reaching the High and Low pressure ports on the '85 928 can be difficult. Even locating them can be difficult. See https://rennlist.com/forums/928-foru...some-help.html for photos. Getting to the high pressure port on my car required removing the electric fan guard/shroud in front of the condenser.
I had difficulty getting the compressor to turn. This worked out to be an intermittent connection between the compressor and A/C Compressor relay at the first spade connection in the engine bay, between the compressor and the main wiring harness at the front of the block, (in front of the timing belt cover and behind the main belt driven fan). A shot of De-Oxit, followed by re-seating the connector cleared the problem.
Thanks to everyone for their help. The A/C now operates correctly, holds vacuum and blows cold air.
Today was a good day.
Regards,
Scott.
EPA Section 609 Certified Mobile A/C Technician
06-06-2014, 10:27 PM
#32
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Congratulations from a fellow 609'er.
06-06-2014, 10:45 PM
#33
Burning Brakes
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