Hey, basjoos. Maybe use this additional heat to keep windshield clear when using two? Possibly, directing heated air between the two windshields for those raining day fog-ups? As to using that heat for the cab, I wouldn't. Been a mechanic for too long, can't stand the oil smell no more. I prefer fresh air. That and it's just the idea of adding more dirty air to breath in. The reasoning that city air is dirty, so why worry? To me would be like putting a loaded gun to your head because you are going to die one day anyways!
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