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Reply to "Heaters yes/no"

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Just to be clear, the time it takes for the oil to come up to full operating temperature doesn't affect how long it takes for the cabin heat to start working at its maximum.

If anything, an exhaust-driven heater box starts putting out almost maximum heat sooner than a liquid coolant-based system. Exhaust gas is pretty much the same temp no matter what the engine oil temp is. And the thin sheet metal in the header and heater box heat up pretty quick, although better heater boxes have somewhat heavier internal vanes.

I don't have any experience with forced-air systems in our cars, but in a modern car, turning up the ventilation fan doesn't seem to make air from the vent get any cooler.

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