Coolant is drawn into the water pump via the lower radiator hose, the water pump pushes the coolant thru both sides of the block and up into the back of both heads, thru the heads then out the front of the heads into the intake manifold then thru the thermostat and into the upper radiator hose into the radiator.
The coolant enters the engine by way of the lower radiator hose and exits the engine by way of the upper radiator hose.
clockwise, if you're looking at the front of the engine
It is in the bottom of the over flow tank.
It goes in through the lower radiator hose, and out through the upper.
The heated coolant comes out of the engine from the connection in the intake manifold and returns thru the connection into the water pump.
bottom to top
If starting from empty pull the top radiator hose off the engine and fill the radiator until coolant starts to flow from the engine hose bib. replace and tighten hose. Fill the overflow tank with coolant. Locate the vent on the coolant hose bib (brass fitting), start the engine and allow coolant flow to purge the air from the system. When coolant flows steadily close the vent. Re-top up the overflow tank.
Probably not. There really is no way to increase the flow in the radiator, but when it decreases the coolant does not get cooled down as quickly thus the coolant gets even hotter. If the flow in the radiator decreases too much you could have an engine over heat which is bad news bears when it comes to the lifetime of your engine.
Yes, it controls the coolant flow around the engine block, without coolant the engine would overheat.
Perhaps low coolant level Perhaops thermostat is not opening allowing coolant flow through the engine
No. The reservoir holds the coolant that flows back into when the engine coolant expands and will flow from the reservoir to the engine when the water cools. but there is no actual through current of liquid. Yes indeed it does on a lot of European vehicles. This occurs mainly in automatic coolant bleed vehicles.
The thermostat in a car regulates the coolant temperature inside the engine. When the engine is cold, the thermostat is closed, allowing the heat from the combustion chamber to heat the fluid (coolant) in the coolant galleys in the engine block. Once the engine reaches an optimal temperature, the thermostat opens, allowing coolant to flow through the radiator. The thermostat then controls the flow of coolant to hold the engine at its optimum operating temperature, irrespective of engine load and operating condtions.