Well after three years took out my 68 in the first winter storm.

I have the fuel fired heater inside and it's toasty but the defrost is simply routed up a hose near the windshield but there is not a plenum or duct to force it to blow on the windshield to actually defrost etc.

Was there ever a duct plenum in these?

If not the only other thing I can think of would be a fan like in a school bus?

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