through the lifters then through the push rods
the oil travels through the lifter, up the pushrod, and dribbles over the rockers. if this is not what is happening in your truck, there is something plugged up or you have a weak oil pump.
In through the bottom hose, out through the top.
It goes in through the lower radiator hose, and out through the upper.
Strainer
Kind of. There are water jackets inside the engine block and usually the heads of a liquid-cooled engine Water (or coolant) will either flow from the block to the head to the radiator, or from the radiator through the head to the block (a reverse flow design). The latter is better because it cools the heads first and helps prevent detonation. It also reduces thermal shock to the engine block.
The heat will flow from the boiling water to the block of ice.
Either the thermostat is stuck in an almost closed position and there is not enough flow of coolant through the engine block or you have a lazy water pump over time the impeller of the water pump wears out causing low coolant flow, so when the car is moving the water pump spins faster letting enough flow through the block.
Viscosity is the term.
Defective thermostat not closing allowing coolant to flow through block at all times
Generally the pump moves the coolant through the block, up into the back of the head(s), through the head(s), out the thermostat into the top of the radiator, through the radiator, out the bottom or side of the radiator and back to the pump.
if you block the flow then AC will be useless
Charge flow through a circut