- Joe_DWow,
That one must have missed the MWO. M1A1's originally were equipped with the Stewart-Warner or Hupp Heaters similar to the M-113A2/A3 series which drew air in from the outside. Wasn't a good idea since it sucked in a lot of dirt and reduced the heater's life. The intakes came in two versions, one being flush to the hull and the other looking like a mushroom. To this day we are still issued two heater plugs because of that, even though that intake is welded over. I was at Riley when we got the MWO to change them along with the new Prime Power Interupt system and change from bus bar for batteries to cables (apx 1993).
Joe D
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