I did a new mod on my car that would be a fair benefit for most average drivers; I insulated the low pressure parts of my air conditioning system under the hood with foam pipe insulation and fiberglass insulation around the accumulator. I had over 2 meters of uninsulated pipe under the hood between the expansion valve and the compressor. This could be very significant for compressor clutch cycling on someone's car where the a/c is used 100% of the time during 4-6 months of the year.
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