Strange car/math question

[factotum]

Friction within the engine, that is. If the car is travelling at a constant speed on level ground, all of the engine power is being lost in friction (air resistance, rolling resistance, friction internal to the engine and other frictions).

None of which are going to contribute toward the engine warming up to operating temperature.

[Radar]

None of which are going to contribute toward the engine warming up to operating temperature.

Not directly, but ammount of heat produced by the engine (no even from friction) depends directly on the needed power output. Said power output is defined exactly by acceleration, vertical speed and external friction contributions.

[snowblizz]

Do cars even use spill heat off engineblock nowadays?

I just get the feeling a modern car would want to separate the AC system entirely. Just so there's less stuff being piped around.

[Knaight]

Friction within the engine, that is. If the car is travelling at a constant speed on level ground, all of the engine power is being lost in friction (air resistance, rolling resistance, friction internal to the engine and other frictions).

All of the work generated by the engine is. The bulk of the power is still lost to heat; the best automotive engine in the world is still less than 50% efficient. Power plants can get above that, but the things that let them do that (stupidly high operating temperatures, mostly) don't transfer well.