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The W126 received a condensor upgrade in 1985. Cars prior to '85 will not cool very well with R134.
My BLACK '85 SD running R134 is a meat locker. Here we see the outside ambient temp is 97f, fan blowing medium speed in 'auto' mode and a left vent temp of around 40f. The compressor will cycle due to low evep temps if the fan is on low speed. Otherwise, I could make ice.
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