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Likewise, all my cars' tie the fans to the A/C. A/C on = fan on. With large amount of blocking in place, ram air is probably diminished, so the fans improve air flow through radiator even at highway speed. Also, the fans are in parallel. They both turn on together.
The frosty A/C hose is probably going from the evaporator to the compressor, not the other way around.
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