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  1. WillWagner

    Converting m939a1 to electric cooling fan

    Clint is correct, the fan set ups on the coaches are a 4 fan configuration that covers the complete core. It will pull small children and animals into the radiator when they are fully on, did I mention they are variable speed? On early trucks, with 5 to 7 blade fans, it was not uncommon to see...
  2. WillWagner

    Converting m939a1 to electric cooling fan

    So can all electric. Most all of the newer transit busses are electric fan only. They do a great job and eliminate the old giant hydraulic pumps needed to turn the fan motors and decrease parasitic load. On the dyno, when the hydraulic fans locked up, there was a noticable HP drop, IIRC right...
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