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An electric fan mounted to the front of the condensor can be retrofitted to your car very easily. They are common in salvage yards around me. The 740 style does not appear to fit easily (mounted dead center on the condensor), but I've never tried. I pulled a fan from a late 70's 260 for my 81 242, as I recall its a 10-12" Bosch unit, mounts via two metal brackets to the vertial support post the horns are mounted to, and to the bit of sheet metal just behind the bumper. So the fan itself is covering the left half of the condensor (from front of car). I suppose if you really wanted you could fit two of them, one on each side, but it would block a ton of air. Wiring is simple, I wired it to a dash switch as my AC is dead (no R12 charge and no cash), but as another poster said, use an inline diode, and wire it to come on when the AC clutch engages. Very late 240's, maybe only the 93 (which should be a r134a system), had a pressure switch somewhere in the AC system that activated the fan, I think. You might look into that if you find one.
AC system improvement? No idea, it's as broken now as it was when I put the fan on. But that little fan does push a good bit of air, helps cooling at idle after high boost=high heat.
Good luck. I learned a lot from this thread, maybe I'll attempt to fix my AC this summer.
Logan
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1981 242GLTurbo 1968 122S Automatic (Summer Project)
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