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when your engine is hot it causes the water to boil and the water and the anti freeze will come out of the overflow pipe.
Heat from the engine causes liquid to expand. It used to overflow onto the ground if it caused enough pressure to open the radiator cap. The overflow tanks were installed to automatically catch and return the coolant to the cooling system.
diesel has a lower boiling point than antifreeze. as the engine heats up the diesel will vapourize and cause high pressure in your system. you will also has much worse temperature control in your engine.
It does not mix under normal conditions. If this is happening with your diesel engine you may have engine trouble.
usually a blown head gasket (most all the time white smoke on a a diesel engine means antifreeze in the combustion chamber)
To the overflow tank and if the radiator has a cap,you will need to fill it with the engine cold.
In the overflow tank as well as the radiator. You should not do this while the engine is HOT!
With the hood open, on the passenger side there is the overflow container for the rad. The cap might be pressurized if the engine is hot. You add the antifreeze there.
That depends on the radiator, not the engine.
The gurgling sound is caused by pressure in the engine coolant system(antifreeze) slowly releasing into the coolant overflow resevoir. Typically a faulty thermostat causes this sound.
Engine overheating will cause the anti-freeze to surge into the overflow tank. A blown head gasket will also cause the anti-freeze to surge into the overflow tank.
You really do not need to. Put the cap on and run the engine, the excess will flow into the overflow canister.