maybe your heater core is leaking if so you need a new one
check hoses and clamps
I had this happen on my 2001 S-10. I had a very slow coolant leak and when the coolant would get low I could hear what sounded like water flowing from around the heater. At first I thought I had water built up inside the A/C evaporator which was gurgling, but finally realized it was a coolant problem. Once I fixed my leak and topped off the coolant the noise was gone. Hope this helps.
A water reservoir is to catch excess water in a flowing system. In a car, the bottle holds coolant that overflows from the top of the radiator on the inside when the engine warms up.
Either the thermostat is stuck shut of the water pump is bad. Make sure that the coolant is full as well, then check the thermostat and pump to see why the coolant isn't flowing.
when the engine is stopped, the coolant stops flowing. The coolant inside the engine can boil and force coolant into the expansion tank. this is normal.
mars has flowing water on it
No, water does not flow through the fins in a car radiator. The fins are there to dissipate heat from the coolant circulating through the radiator tubes. Air passing over the fins helps cool down the hot coolant flowing through the tubes.
Flowing water has kinetic energy
One way is: with a cold engine, take off the radiator cap, start the engine and let it run to operating temp, and look into the radiator to see if you see any coolant flowing usually from one side of the radiator to the other. If you look in the radiator and the coolant is not moving, then your water pump is probably gone, and don't overheat your engine. Without coolant flowing through the engine you cna overheat the engien and cause severe damage.
Water jackets are the hollowed out spaces in the engine block and head through which the coolant flows. In water jackets, waste heat generated by the engine is picked up by the coolant. After flowing through the water jackets, water flows through the radiator. The radiator is basically a heat exchanger which, through a system of tubes and fins, transfers this waste heat from the coolant to the atmosphere. After the water is cooled in the radiator, it flows back into the water jackets of the engine to pick up more waste heat.
Mars and Venus might have had flowing water.
Water flowing out of the ground is a spring. An artesian well is one example of water under pressure flowing out of the ground.
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