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Old 07-08-2010, 11:17 PM
Join Date: May 2004
Location: Nassau/ Bahamas
Posts: 68
74 450SL A/C upgrade

Hi all,
I would like to upgrade a clients 1974 SL450 A/C system. Are there any suggestions to improve the efficiency or replace components?


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Old 07-09-2010, 08:22 AM
Posts: n/a
UPGRADE? The only upgrade necessary would be if it has been changed to a refrigerant other than R12.

If it's still on R12 and not cooling well, check pressures and functionality. Post low and high side pressures, ambient temp at the time of their reading and vent temp. We can then go from there.
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Old 07-11-2010, 06:45 PM
Join Date: Sep 2005
Posts: 664
If this system was changed over to R-134 and the expansion valve was not changed that could be the problem.

But you have many test to run on this. It may just be a worn compressor.

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