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Coolant is added to a 1996 Hyundai Sonata by opening the coolant overflow tank and adding coolant until the full mark is reached. This allows the cooling system to pull in coolant as needed from the reserve tank.
sounds like blockage in the cooling system. See if you are not low on coolant in the radiator. Just because your reserve tank has coo;ant does not mean that you have enough coolant in the radiator. If you have low coolant in the radiator, it will blow cold. It can happen abruptly. If you are low on coolant in the radiator and not in your reserve tank you will need to find out why the system is not pulling coolant out of the reserve tank.
there is a drain plug on the bottom tank of the radiator
Rust from your cooling system is flowing back into the overflow tank when the motor warms up.
Drain and flush your entire cooling system.
It does not have a reserve switch - it has a sensor in the reserve tank that turns a light on on the dash when you are low on fuel.
Remove the tank Take it to one of those pressure car washes Pressure wash it out Take home Rinse well Reinstall Add correct coolant mixture to the tank. Consider cleaning the cooling system out with a cleaner and replacing the radiator cap. Gunk in the tank indicates gunk in the cooling system.
The radiator reserve tank is commonly mounted on one of the front fenders. The tank will have a hose connecting it to the radiator.
When you fill it up gas flows to the reserve tank first and then flows into the main tank.
Stuck Thermostat, or defective cooling fan/thermal relay, would be my guess.
looks like cilinder head gasket is defect, engine pressure is coming in radiator, and cooling fluid goes into motor
If the cooling system has ONLY water in it, you need to add coolant in order to maintain a ceertain ratio of coolant content to water content. Water by itself is not sufficient to carry off the engine's heat. If you do have coolant in the system - then you should check the cooling fan for proper operation (i.e.: is it coming on and runnng when the cooling system is hot?) - Also check to determine if the water pump has failed. Because of the age of your vehicle (mine is a 2000) my guess is that it is going to be a failed cooling fan sensor, or a water pump failure.