Just wondering, do some trucks have a hot air intake, which helps it start up in cold weather?
Older carburetted trucks had a heat riser that was attached to a shroud around the exhaust manifold, a thermostatic valve opened it when the engine was cold to direct warmed air into the intake. It helped vaporize the gasoline better. Some diesels have electrically heated intakes, and some of the older ones have flame heaters in the intakes. The flame heater had a fuel nozzle and an igniter (a spark plug) that heated up the intake so that the hot intake would warm the air. They were a lot of fun if some idiot tried using ether to start the engine along with the flame heater. Most diesels now use either an ether system, since ether ignites at a lower temperature, or glow plugs which heat the upper cylinders directly.
Some Diesel engines have a heater element that heats the intake air before starting?? Unsure of any other.
Sort of. In cold weather, when starting, the intake air is redirected into a shroud around the exhaust manifold, which will heat the air before it goes into the engine intake. The manifold heats up quite quickly after starting, and in less than a minute hot air is flowing into the intake. Some vehicles have a heater wire grid under the throttle body, and that warms the air also.
